99900 - Disclosure - Standard And Custom Axis Domain Defaults link:presentationLink link:calculationLink link:definitionLink 995200100 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 995200200 - Statement - Condensed Consolidated Statements of Comprehensive Income (Loss) link:presentationLink link:calculationLink link:definitionLink 995200400 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 995200405 - Statement - Condensed Consolidated Statements of Cash Flows (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 99940102 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Balance Sheet Disclosures (Details) link:presentationLink link:calculationLink link:definitionLink 99940501 - Disclosure - PROPERTY AND EQUIPMENT (Details) link:presentationLink link:calculationLink link:definitionLink 99940503 - Disclosure - PROPERTY AND EQUIPMENT - Major components of internal-use software (Details) link:presentationLink link:calculationLink link:definitionLink 99940701 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Details) link:presentationLink link:calculationLink link:definitionLink 99940802 - Disclosure - DEBT - Indebtedness (Details) link:presentationLink link:calculationLink link:definitionLink 99940803 - Disclosure - DEBT - Interest expense related to Notes (Details) link:presentationLink link:calculationLink link:definitionLink 99941302 - Disclosure - SEGMENT DISCLOSURES - Segment income (loss) (Details) link:presentationLink link:calculationLink link:definitionLink 995200090 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 995200105 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 995200300 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 99930403 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 99930603 - Disclosure - CAPITALIZED SOFTWARE (Tables) link:presentationLink link:calculationLink link:definitionLink 99931003 - Disclosure - EARNINGS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 99931103 - Disclosure - STOCK-BASED AWARD PLANS (Tables) link:presentationLink link:calculationLink link:definitionLink 99940101 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) link:presentationLink link:calculationLink link:definitionLink 99940103 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Software Development Costs (Details) link:presentationLink link:calculationLink link:definitionLink 99940201 - Disclosure - REVENUE RECOGNITION - Disaggregation of revenue (Details) link:presentationLink link:calculationLink link:definitionLink 99940202 - Disclosure - REVENUE RECOGNITION - Accounts receivable, net (Details) link:presentationLink link:calculationLink link:definitionLink 99940203 - Disclosure - REVENUE RECOGNITION - Allowance and deferred allowance (Details) link:presentationLink link:calculationLink link:definitionLink 99940205 - Disclosure - REVENUE RECOGNITION - Contract cost balances (Details) link:presentationLink link:calculationLink link:definitionLink 99940301 - Disclosure - INVESTMENTS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 99940401 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Financial assets and liabilities measured at fair value (Details) link:presentationLink link:calculationLink link:definitionLink 99940402 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Estimated fair values of Tellutax contingent consideration (Details) link:presentationLink link:calculationLink link:definitionLink 99940403 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Non-recurring Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 99940404 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Earn out consideration (Details) link:presentationLink link:calculationLink link:definitionLink 99940405 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Cash earn-outs and Stock earn-outs are recorded at fair value (Details) link:presentationLink link:calculationLink link:definitionLink 99940406 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair value of Cash and Stock Earn-outs (Details) link:presentationLink link:calculationLink link:definitionLink 99940407 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Changes in fair value of contingent consideration (Details) link:presentationLink link:calculationLink link:definitionLink 99940502 - Disclosure - PROPERTY AND EQUIPMENT - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 99940504 - Disclosure - PROPERTY AND EQUIPMENT - Amounts included in property and equipment additions related to capitalized internal-use software (Details) link:presentationLink link:calculationLink link:definitionLink 99940601 - Disclosure - CAPITALIZED SOFTWARE (Details) link:presentationLink link:calculationLink link:definitionLink 99940702 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 99940801 - Disclosure - DEBT - Credit Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 99940901 - Disclosure - STOCKHOLDERS' EQUITY (Details) link:presentationLink link:calculationLink link:definitionLink 99941001 - Disclosure - EARNINGS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 99941002 - Disclosure - EARNINGS PER SHARE - Weighted-average outstanding shares of common stock equivalents (Details) link:presentationLink link:calculationLink link:definitionLink 99941101 - Disclosure - STOCK-BASED AWARD PLANS - 2020 Plan (Details) link:presentationLink link:calculationLink link:definitionLink 99941102 - Disclosure - STOCK-BASED AWARD PLANS - Options under 2020 Plan (Details) link:presentationLink link:calculationLink link:definitionLink 99941103 - Disclosure - STOCK-BASED AWARD PLANS - Options under 2020 Plan Price Range (Details) link:presentationLink link:calculationLink link:definitionLink 99941104 - Disclosure - STOCK-BASED AWARD PLANS - Restricted Stock Units (Details) link:presentationLink link:calculationLink link:definitionLink 99941105 - Disclosure - STOCK-BASED AWARD PLANS - Restricted Stock Awards (Details) link:presentationLink link:calculationLink link:definitionLink 99941106 - Disclosure - STOCK-BASED AWARD PLANS - Performance Stock Units (Details) link:presentationLink link:calculationLink link:definitionLink 99941107 - Disclosure - STOCK-BASED AWARD PLANS - Employee Stock Purchase Plan (Details) link:presentationLink link:calculationLink link:definitionLink 99941108 - Disclosure - STOCK-BASED AWARD PLANS - ESPP - Option-pricing model key input assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 99941109 - Disclosure - STOCK-BASED AWARD PLANS - Stock based compensation (Details) link:presentationLink link:calculationLink link:definitionLink 99941110 - 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