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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |
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Sep. 18, 2006 | Jan. 01, 2005 | Dec. 31, 2004 | Aug. 31, 2017 | May 31, 2017 | May 31, 2006 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Aug. 31, 2018 | Jun. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Aug. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | Sep. 30, 2013 | Jun. 30, 2012 | Jun. 30, 1996
2015 Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000.0 |  | $ 15,000,000.0 |  |  |  |  |  |
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 |
Vesting period |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for future grant (in shares) |  |  |  |  |  |  | 10,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional shares reserved for future issuance (in shares) |  |  |  |  |  |  |  |  |  | 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) |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional shares reserved for future issuance (in shares) |  |  |  |  |  |  |  |  |  |  | 1,500,000 | 1,500,000 |  |  |  |  |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  |  |  |  |  |  | $ 10,000,000 | $ 9,000,000 | $ 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  |  |  |  | $ 107,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period of recognition for unrecognized compensation expense |  |  |  |  |  |  | 2 years 3 months 18 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 |  |  |  |  |  |  | $ 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period of recognition for unrecognized compensation expense |  |  |  |  |  |  | 7 months 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of extension | 10 years |  |  | 10 years | 10 years | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued under employee stock purchase plan |  |  |  |  |  |  | $ 500,000 | $ 400,000 | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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