EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION, Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | | |
Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Jan. 25, 2017 | Apr. 30, 2016 |
Restricted Stock Units (RSUs) [Member] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | |
Share-based compensation expense | | $ 3,111 | | $ 2,819 | | | |
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value [Roll Forward] | | | | | | | |
Total intrinsic value | | 6,600 | | 5,200 | | | |
Total grant date fair value | | $ 6,100 | | 5,000 | | | |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | |
Period following change of control | | 18 months | | | | | |
Time-Based Restricted Stock Units [Member] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | |
Unrecognized compensation expense | | $ 21,300 | | | | | |
Weighted average service period for recognition of unrecognized compensation costs | | 2 years 2 months 12 days | | | | | |
Restricted Stock Unit Activity, Number of Shares [Roll Forward] | | | | | | | |
Nonvested, beginning of period (in shares) | | 535,000 | | | | | |
Granted (in shares) | | 131,000 | | | | | |
Vested (in shares) | [1] | (81,000) | | | | | |
Canceled and forfeited (in shares) | | (3,000) | | | | | |
Nonvested, end of period (in shares) | | 582,000 | | | | | |
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value [Roll Forward] | | | | | | | |
Nonvested, beginning of period (in dollars per share) | [2] | $ 46.62 | | | | | |
Granted (in dollars per share) | [2] | 45.84 | | | | | |
Vested (in dollars per share) | [1],[2] | 44.38 | | | | | |
Canceled and forfeited (in dollars per share) | [2] | 46.26 | | | | | |
Nonvested, end of period (in dollars per share) | [2] | $ 46.76 | | | | | |
Time-Based Restricted Stock Units [Member] | Employees [Member] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | |
Award vesting period | | 4 years | | | | | |
Vesting percentage after first year | | 5.00% | | | | | |
Additional vesting percentage after second year | | 10.00% | | | | | |
Additional vesting percentage after third year | | 15.00% | | | | | |
Additional vesting percentage after fourth year | | 70.00% | | | | | |
Time-Based Restricted Stock Units [Member] | Non-Employee Directors [Member] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | |
Vesting percentage after first year | | 100.00% | | | | | |
Performance-Based Restricted Stock Units [Member] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | |
Unrecognized compensation expense | | $ 12,600 | | | | | |
Weighted average service period for recognition of unrecognized compensation costs | | 2 years 1 month 6 days | | | | | |
Restricted Stock Unit Activity, Number of Shares [Roll Forward] | | | | | | | |
Nonvested, beginning of period (in shares) | | 439,000 | | | | | |
Granted (in shares) | | 137,000 | | | | | |
Vested (in shares) | [1] | (62,000) | | | | | |
Canceled and forfeited (in shares) | | 0 | | | | | |
Nonvested, end of period (in shares) | | 514,000 | | | | | |
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value [Roll Forward] | | | | | | | |
Nonvested, beginning of period (in dollars per share) | [2] | $ 47.40 | | | | | |
Granted (in dollars per share) | [2] | 45.84 | | | | | |
Vested (in dollars per share) | [1],[2] | 40.82 | | | | | |
Canceled and forfeited (in dollars per share) | [2] | 0 | | | | | |
Nonvested, end of period (in dollars per share) | [2] | $ 47.78 | | | | | |
FY 2017 Performance RSUs [Member] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | |
Approved restricted stock unit awards (performance vesting) (in shares) | | | | | | | 152,000 |
Share-based compensation expense | | | $ 0 | | $ 600 | | |
Aggregate estimated grant date fair value | | | | $ 6,800 | | | |
FY 2017 Performance RSUs [Member] | Target Condition One [Member] | | | | | | | |
Performance target of restricted stock units by vesting date [Abstract] | | | | | | | |
Shares issuable upon settlement | | 25.00% | | | | | |
Consolidated income from operations | | > 90% of target | | | | | |
Vesting Date | | Third anniversary of the date of grant | | | | | |
FY 2017 Performance RSUs [Member] | Target Condition Two [Member] | | | | | | | |
Performance target of restricted stock units by vesting date [Abstract] | | | | | | | |
Shares issuable upon settlement | | 25.00% | | | | | |
Consolidated income from operations | | > 90% of target | | | | | |
Vesting Date | | Fourth anniversary of the date of grant | | | | | |
FY 2017 Performance RSUs [Member] | Target Condition Three [Member] | | | | | | | |
Performance target of restricted stock units by vesting date [Abstract] | | | | | | | |
Shares issuable upon settlement | | 25.00% | | | | | |
Consolidated income from operations | | >100% of target | | | | | |
Vesting Date | | Third anniversary of the date of grant | | | | | |
FY 2017 Performance RSUs [Member] | Target Condition Four [Member] | | | | | | | |
Performance target of restricted stock units by vesting date [Abstract] | | | | | | | |
Shares issuable upon settlement | | 25.00% | | | | | |
Consolidated income from operations | | > 100% of target | | | | | |
Vesting Date | | Fourth anniversary of the date of grant | | | | | |
FY 2017 Performance RSUs [Member] | Target Condition Three And Four [Member] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | |
Aggregate estimated grant date fair value | | | | | | $ 4,000 | |
FY 2017 Performance RSUs Vesting for CEO [Member] | Target Condition One [Member] | | | | | | | |
Performance target of restricted stock units by vesting date [Abstract] | | | | | | | |
Shares issuable upon settlement | | 18.00% | | | | | |
Consolidated income from operations | | > 90% of target | | | | | |
Vesting Date | | Third anniversary of the date of grant | | | | | |
FY 2017 Performance RSUs Vesting for CEO [Member] | Target Condition Two [Member] | | | | | | | |
Performance target of restricted stock units by vesting date [Abstract] | | | | | | | |
Shares issuable upon settlement | | 18.00% | | | | | |
Consolidated income from operations | | > 90% of target | | | | | |
Vesting Date | | Fourth anniversary of the date of grant | | | | | |
FY 2017 Performance RSUs Vesting for CEO [Member] | Target Condition Three [Member] | | | | | | | |
Performance target of restricted stock units by vesting date [Abstract] | | | | | | | |
Shares issuable upon settlement | | 32.00% | | | | | |
Consolidated income from operations | | >100% of target | | | | | |
Vesting Date | | Third anniversary of the date of grant | | | | | |
FY 2017 Performance RSUs Vesting for CEO [Member] | Target Condition Four [Member] | | | | | | | |
Performance target of restricted stock units by vesting date [Abstract] | | | | | | | |
Shares issuable upon settlement | | 32.00% | | | | | |
Consolidated income from operations | | > 100% of target | | | | | |
Vesting Date | | Fourth anniversary of the date of grant | | | | | |
FY 2017 Performance RSUs Vesting 1 and CEO [Member] | Target Condition One And Two [Member] | | | | | | | |
Restricted Stock Unit Activity, Number of Shares [Roll Forward] | | | | | | | |
Granted (in shares) | | | | 68,000 | | | |
FY 2017 Performance RSUs Vesting 1 and CEO [Member] | Target Condition Three And Four [Member] | | | | | | | |
Restricted Stock Unit Activity, Number of Shares [Roll Forward] | | | | | | | |
Granted (in shares) | | | | 84,000 | | | |
FY 2018 Performance RSUs [Member] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | |
Approved restricted stock unit awards (performance vesting) (in shares) | | 137,000 | | | | | |
FY 2018 Performance RSUs [Member] | Target Condition One [Member] | | | | | | | |
Performance target of restricted stock units by vesting date [Abstract] | | | | | | | |
Shares issuable upon settlement | | 50.00% | | | | | |
Consolidated income from operations before income tax provision | | > 90% of target | | | | | |
Vesting Date | | Third anniversary of the date of grant | | | | | |
FY 2018 Performance RSUs [Member] | Target Condition Two [Member] | | | | | | | |
Performance target of restricted stock units by vesting date [Abstract] | | | | | | | |
Shares issuable upon settlement | | 50.00% | | | | | |
Consolidated income from operations before income tax provision | | > 90% of target | | | | | |
Vesting Date | | Fourth anniversary of the date of grant | | | | | |
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[1] | The number of restricted stock units vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements. | |
[2] | The weighted average grant date fair value of restricted stock units is based on the number of shares and the closing market price of our common stock on the date of grant. | |