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STOCK BASED COMPENSATION - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2005 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized shares available for future issuance (in shares) |  | 10,026,282 |  |
Proceeds from exercise of stock options |  | $ 1,436 | $ 1,106 | $ 1,686
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate intrinsic value of options exercised |  | 24,800 | 4,900 | 9,200
Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs |  | $ 5,300 |  |
Weighted-average period for recognition |  | 3 years 1 month |  |
Intrinsic value of RSU's vested |  | $ 6,200 | $ 4,600 | $ 6,400
Total intrinsic value of all awards outstanding |  | $ 9,400 |  |
2010 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized number of shares (in shares) |  | 8,000,000 |  |
2010 Plan | Stock options and RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 4 years |  |
2005 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration period |  | 10 years |  |
Additional awards that may be granted (in shares) |  | 0 |  |
Minimum | 2010 Plan | Stock options and RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration period |  | 5 years |  |
Minimum | 2010 Plan | Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Option price as percentage of fair market value on the date of grant |  | 100.00% |  |
Maximum | 2010 Plan | Stock options and RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration period |  | 10 years |  |
First anniversary | 2005 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting percentage | 25.00% |  |  |
Monthly | 2005 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |

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