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STOCK BASED COMPENSATION (Tables) | 12 Months Ended
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Aug. 31, 2017
STOCK BASED COMPENSATION [Abstract] |
Summary of Shares Authorized and Shares Available for Future Grants |
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﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  | Shares available to grant
﻿ |  | Shares authorized for issuance as of August 31, 2017 |  | August 31, |  | August 31,
﻿ |  | (including shares originally authorized for issuance under prior plans) |  | 2017 |  | 2016
﻿2013 Plan |  | 944,905 |  |  | 637,822 |  |  | 615,889
﻿
Summary of Components of Stock-Based Compensation Expense |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended August 31,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Options granted to directors |  | $ | 18 |  | $ | 72 |  | $ | 86
﻿Restricted stock awards |  |  | 7,301 |  |  | 7,103 |  |  | 4,599
﻿Restricted stock units |  |  | 2,370 |  |  | 1,946 |  |  | 1,284
﻿Stock-based compensation expense |  | $ | 9,689 |  | $ | 9,121 |  | $ | 5,969
﻿
Summary of Other Information Related to Stock-Based Compensation |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Balance as of
﻿ |  | August 31, |  | August 31, |  | August 31,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Remaining unrecognized compensation cost (in thousands) |  | $ | 26,382 |  | $ | 32,380 |  | $ | 18,421
﻿Weighted average period of time over which this cost will be recognized (years) |  |  | 3 |  |  | 4 |  |  | 5
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended
﻿ |  | August 31, |  | August 31, |  | August 31,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Excess tax benefit (deficiency) on stock-based compensation (in thousands) |  | $ | 165 |  | $ | 610 |  | $ | 1,206
﻿
Summary of Restricted Stock Awards and Units Activity |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended
﻿ |  | August 31, |  | August 31, |  | August 31,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Grants outstanding at beginning of period |  |  | 509,880 |  |  | 366,021 |  |  | 488,416
﻿Granted |  |  | 56,724 |  |  | 276,530 |  |  | 36,382
﻿Forfeited |  |  | (40,023) |  |  | (1,372) |  |  | (10,738)
﻿Vested |  |  | (122,213) |  |  | (131,299) |  |  | (148,039)
﻿Grants outstanding at end of period |  |  | 404,368 |  |  | 509,880 |  |  | 366,021
﻿
Summary of Weighted Average Per Share Grant Date Fair Value for Restricted Stock Awards and Units |
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﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended
﻿ |  | August 31, |  | August 31, |  | August 31,
﻿Weighted Average Grant Date Fair Value |  | 2017 |  | 2016 |  | 2015
﻿Restricted stock awards and units granted |  | $ | 87.43 |  | $ | 84.69 |  | $ | 88.40
﻿Restricted stock awards and units vested |  | $ | 77.85 |  | $ | 71.19 |  | $ | 45.20
﻿Restricted stock awards and units forfeited |  | $ | 77.19 |  | $ | — |  | $ | 65.67
﻿
Summary of Total Fair Market Value of Restricted Stock Awards and Units Vested |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended
﻿ |  | August 31, |  | August 31, |  | August 31,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Total fair market value of restricted stock awards and units vested (in thousands) |  | $ | 10,135 |  | $ | 10,139 |  | $ | 13,192
﻿
Summary of Shares Repurchased |
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﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended
﻿ |  | August 31, |  | August 31, |  | August 31,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Shares repurchased |  |  | 38,634 |  |  | 43,171 |  |  | 52,396
﻿Cost of repurchase of shares (in thousands) |  | $ | 3,193 |  | $ | 3,334 |  | $ | 4,677
﻿

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