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Stock Plans (Tables) | 12 Months Ended
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Aug. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Restricted Stock and Performance Shares Activity | A summary of restricted stock and performance shares activity during fiscal 2019 is as follows:
| Number of Shares |  | Weighted-Average Fair Value at Grant Date (Per Share)
Outstanding on August 31, 2018 | 1,153,737 |  |  | $25.25
Granted | 705,602 |  |  | 22.75
Forfeited | (117,899 | ) |  | 24.24
Vested | (460,614 | ) |  | 25.49
Outstanding on August 31, 2019 | 1,280,826 |  |  | $23.87
Summary Stock option Activity | A summary of stock option activity during fiscal 2019 is as follows:
|  | Shares |  | Weighted-Average Exercise Price (Per Share) |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding on September 1, 2018 |  | 1,769,076 |  |  | $ | 25.40 |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |
Exercised |  | (84,277 | ) |  | 19.72 |  |  |  |  |
Forfeited |  | (19,566 | ) |  | 24.44 |  |  |  |  |
Expired |  | (58,690 | ) |  | 20.77 |  |  |  |  |
Outstanding on August 31, 2019 |  | 1,606,543 |  |  | $ | 25.88 |  |  | 4.1 |  | $ | 0.5 | million
Exercisable on August 31, 2019 |  | 1,298,308 |  |  | $ | 26.01 |  |  | 3.5 |  | $ | 0.5 | million
Summary of Weighted Average Grant-Date Fair Value Of options, Total Intrinsic Value of Options Exercised, and Cash Receipts from Options Exercised | A summary of the weighted-average grant-date fair value of options, total intrinsic value of options exercised, and cash receipts from options exercised is summarized below (in thousands, except per share amounts):
| Year Ended August 31,
| 2019 |  | 2018 |  | 2017
Weighted-average fair value of options granted (per share) | N/A |  |  | N/A |  |  | $ | 11.88 |
Intrinsic value of options exercised | $ | 429 |  |  | $ | 5,284 |  |  | 2,208 |
Cash receipts from exercise of options | 1,404 |  |  | 15,140 |  |  | 7,762 |
Weighted Average Assumptions | The following weighted-average assumptions were used in fiscal year 2017:
| Fiscal Year Ended August 31, 2017
Dividend yield | 0.15 | %
Expected volatility | 38.12 | %
Risk-free rate of return | 2.42 | %
Expected forfeiture rate | 11 | %
Expected life | 7.4 years |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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