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Stock Plans (Tables) | 12 Months Ended
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Aug. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary Stock option Activity | A summary of stock option activity during fiscal 2016 is as follows:
|  | Shares |  | Weighted-Average Exercise Price (Per Share) |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding on September 1, 2015 |  | 3,852,663 |  |  | $ | 24.47 |  |  |  |  |
Granted |  | 445,093 |  |  | 22.22 |  |  |  |  |
Exercised |  | (175,950 | ) |  | 20.27 |  |  |  |  |
Forfeited |  | (643,744 | ) |  | 26.85 |  |  |  |  |
Outstanding on August 31, 2016 |  | 3,478,062 |  |  | $ | 23.96 |  |  | 4.8 |  | $ | 6.3 | million
Exercisable on August 31, 2016 |  | 2,471,907 |  |  | $ | 24.29 |  |  | 3.2 |  | $ | 4.6 | 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,
| 2016 |  | 2015 |  | 2014
Weighted-average fair value of options granted (per share) | $ | 8.63 |  |  | $ | 8.35 |  |  | $ | 14.46 |
Intrinsic value of options exercised | 989 |  |  | 366 |  |  | 16,380 |
Cash receipts from exercise of options | 3,564 |  |  | 1,147 |  |  | 22,423 |
Summary Of Restricted Stock Activity | A summary of restricted stock activity (including Performance Shares) during fiscal 2016 is as follows:
| Number of Shares |  | Weighted-Average Fair Value at Grant Date (Per Share)
Outstanding on August 31, 2015 | 1,197,268 |  |  | $28.13
Granted | 793,648 |  |  | 22.64
Forfeited | (306,339 | ) |  | 26.83
Vested | (331,072 | ) |  | 28.25
Outstanding on August 31, 2016 | 1,353,505 |  |  | 25.21
Weighted Average Assumptions | The following weighted-average assumptions were used in each fiscal year:
| Fiscal Year Ended August 31,
| 2016 |  | 2015 |  | 2014
Dividend yield | 0.19 | % |  | 0.15 | % |  | 0.11 | %
Expected volatility | 38.06 | % |  | 37.80 | % |  | 38.30 | %
Risk-free rate of return | 2.06 | % |  | 1.19 | % |  | 0.70 | %
Expected forfeiture rate | 13 | % |  | 14 | % |  | 14 | %
Expected life | 6.1 years |  |  | 6.1 years |  |  | 6.1 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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