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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The cash outflow to reacquire common stock during the period.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Net number of share options (or share units) granted during the period.

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Number of shares issued under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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STOCK-BASED COMPENSATION AND STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)				1 Months Ended			12 Months Ended
	Sep. 18, 2006	Jan. 01, 2005	Dec. 31, 2004	May 31, 2020	May 31, 2017	May 31, 2006	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Feb. 28, 2022	Dec. 31, 2021	Dec. 31, 2020	Aug. 31, 2020	Aug. 31, 2019	Feb. 28, 2019	Aug. 31, 2018	Jan. 31, 2018	Oct. 31, 2017	Aug. 31, 2016	Jul. 31, 2015	Nov. 30, 2014	Aug. 31, 2014	Sep. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)							0	0	0
Number of shares released in the period (in shares)							298,414
Payments for Repurchase of Common Stock							$ 44,976,000	$ 0	$ 0
Convertible Debt \| Convertible Senior Notes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Debt instrument, face value							$ 500,000,000	362,500,000			$ 137,500,000				$ 287,500,000
Debt instrument, interest rate							0.50%				0.50%				0.50%
Restricted stock units and Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense							$ 119,500,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised							15,300,000	8,000,000	10,100,000
Unamortized stock-based compensation expense							$ 41,000
Weighted average period of recognition for unrecognized compensation expense							4 months 24 days
Stock Purchase Right
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense							$ 0
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense							$ 26,100,000
Change in number of shares earned							2.00%
Maximum percentage of awards to be earned							200.00%
Total shareholder return performance, lowest percentage to still earn awards							30.00%
Minimum \| Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							1 year
Maximum \| Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							3 years
2017 Repurchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount					$ 25,000,000
Stock repurchase program, remaining authorized repurchase amount							$ 7,100,000
2006 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)						7,000,000
Vesting period							4 years
Expiration period							10 years
Number of shares available for future grant (in shares)							0
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)																								4,100,000
Expiration period							10 years
Number of shares available for future grant (in shares)							8,700,000
Number of additional shares reserved for future issuance (in shares)														12,000,000		16,300,000			4,500,000			6,800,000
2012 Plan \| Minimum \| Restricted stock units and Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							3 years
2012 Plan \| Maximum \| Restricted stock units and Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							4 years
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)																							1,000,000
Vesting period							4 years
Expiration period							10 years
Number of shares available for future grant (in shares)							0
Number of additional shares reserved for future issuance (in shares)																				1,200,000	1,200,000
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)																		1,000,000
Vesting period							3 years
Expiration period							10 years
Number of shares available for future grant (in shares)							1,400,000
Number of additional shares reserved for future issuance (in shares)										1,500,000		1,400,000					1,500,000
Employee Stock Purchase Plan \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense							$ 3,600,000
Weighted average period of recognition for unrecognized compensation expense							6 months 14 days
Term of extension	10 years				10 years	10 years
Annual increase in shares available for issuance (in shares)					500,000
Number of additional shares reserved for issuance (in shares)				3,000,000
Value of shares issued under employee stock purchase plan							$ 700,000	$ 700,000	$ 600,000
Percentage of market value price of common stock under Employee Stock Purchase Plan							85.00%
Duration of offering period		1 year	2 years
Duration of purchase period		6 months
Maximum contribution percentage amount of employee's base compensation							10.00%						20.00%