STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)				1 Months Ended			12 Months Ended
	Sep. 18, 2006	Jan. 01, 2005	Dec. 31, 2004	Aug. 31, 2017	May 31, 2017	May 31, 2006	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018	Jun. 30, 2018	Oct. 31, 2017	Aug. 31, 2016	Jul. 31, 2015	Nov. 30, 2014	Aug. 31, 2014	Sep. 30, 2013	Jun. 30, 2012	Jun. 30, 1996
2017 Repurchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount					$ 25,000,000.0
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)							17,700,000
Number of additional shares reserved for future issuance (in shares)											12,000,000	16,300,000			4,500,000			6,800,000
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)							500,000
Number of additional shares reserved for future issuance (in shares)													1,500,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised							$ 10,100,000	$ 10,000,000.0	$ 9,000,000.0
Unamortized stock-based compensation expense							$ 122,100,000
Weighted average period of recognition for unrecognized compensation expense							1 year 10 months 24 days
Employee Stock | Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)							500,000														500,000
Unamortized stock-based compensation expense							$ 1,100,000
Weighted average period of recognition for unrecognized compensation expense							6 months
Term of extension	10 years			10 years	10 years	10 years
Value of shares issued under employee stock purchase plan							$ 600,000	$ 500,000	$ 400,000
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%
Minimum | Restricted Stock Units (RSUs) | 2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							3 years
Maximum | Restricted Stock Units (RSUs) | 2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							4 years
Forecast | Employee Stock | Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum contribution percentage amount of employee's base compensation										20.00%