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Stockholders' Equity (Tables) | 12 Months Ended
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Aug. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Recognized Stock-based Compensation Expense | The Company recognized stock-based compensation expense within selling, general and administrative expense as follows (in thousands):
| Fiscal Year Ended August 31,
| 2018 |  | 2017 |  | 2016
Restricted stock and stock appreciation rights (“SARS”) | $ | 84,082 |  |  | $ | 42,122 |  |  | $ | 52,459 |
Employee stock purchase plan | 6,891 |  |  | 6,334 |  |  | 6,538 |
Other (1) | 7,538 |  |  | 88 |  |  | — |
Total | $ | 98,511 |  |  | $ | 48,544 |  |  | $ | 58,997 |
(1) For the fiscal year ended August 31, 2018, represents a one-time cash-settled stock award that vested on November 30, 2017.
Schedule of Shares Available for Issuance | Following is a reconciliation of the shares available to be issued under the 2011 Plan as of August 31, 2018:
| Shares Available for Grant
Balance as of August 31, 2017 | 12,228,936 |
SARS canceled | 35,439 |
Restricted stock awards forfeited, net of grants(1) | 572,783 |
Balance as of August 31, 2018 | 12,837,158 |
(1) Represents the maximum number of shares that can be issued based on the achievement of certain performance criteria.
Summary of Option Activity | The following table summarizes SARS activity from August 31, 2017 through August 31, 2018:
| SARS Outstanding |  | Average Intrinsic Value (in thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life (years)
Outstanding as of August 31, 2017 | 319,241 |  |  | $ | 3,651 |  |  | $ | 19.91 |  |  | 2.10
SARS canceled | (35,439 | ) |  |  |  | $ | 21.56 |  |  |
SARS exercised | (127,001 | ) |  |  |  | $ | 21.31 |  |  |
Outstanding and exercisable as of August 31, 2018 | 156,801 |  |  | $ | 1,748 |  |  | $ | 18.41 |  |  | 3.10
Restricted Stock Activity | The following table summarizes restricted stock activity from August 31, 2017 through August 31, 2018:
| Shares |  | Weighted- Average Grant-Date Fair Value
Outstanding as of August 31, 2017 | 11,652,319 |  |  | $ | 22.00 |
Changes during the period |  |  |
Shares granted(1) | 2,751,300 |  |  | $ | 29.40 |
Shares vested | (2,727,229 | ) |  | $ | 22.95 |
Shares forfeited | (3,324,083 | ) |  | $ | 19.20 |
Outstanding as of August 31, 2018 | 8,352,307 |  |  | $ | 24.34 |
(1) | For those shares granted that are based on the achievement of certain performance criteria, the amount represents the maximum number of shares that can vest. During the fiscal year ended August 31, 2018, the Company awarded approximately 1.4 million time-based restricted stock units, 0.4 million performance-based restricted stock units and 0.4 million market-based restricted stock units based on target performance criteria.
Schedule of Share-based Compensation Information | The following table represents the restricted stock and SARS stock-based compensation information for the periods indicated (in thousands):
| Fiscal Year Ended August 31,
| 2018 |  | 2017 |  | 2016
Intrinsic value of SARS exercised | $ | 909 |  |  | $ | 5,053 |  |  | $ | 506 |
Fair value of restricted stock vested | $ | 62,592 |  |  | $ | 44,010 |  |  | $ | 34,857 |
Tax benefit (expense) for stock compensation expense(1) | $ | 1,122 |  |  | $ | 560 |  |  | $ | 991 |
Unrecognized stock-based compensation expense — restricted stock | $ | 41,940 |  |  |  |  |
Remaining weighted-average period for restricted stock expense | 1.4 years |  |  |  |  |
(1) | Classified as income tax expense within the Consolidated Statements of Operations.
Weighted Average Assumptions used in Black-Scholes Option Pricing Model | The fair value of shares issued under the ESPP was estimated on the commencement date of each offering period using the Black-Scholes option pricing model. The following weighted-average assumptions were used in the model for each respective period:
| Fiscal Year Ended August 31,
| 2018 |  | 2017 |  | 2016
Expected dividend yield | 0.6 | % |  | 0.8 | % |  | 0.7 | %
Risk-free interest rate | 1.4 | % |  | 0.5 | % |  | 0.3 | %
Expected volatility (1) | 23.0 | % |  | 33.0 | % |  | 28.1 | %
Expected life | 0.5 years |  |  | 0.5 years |  |  | 0.5 years |
(1) | The expected volatility was estimated using the historical volatility derived from the Company’s common stock.
Cash Dividends Declared to Common Stockholders | The following table sets forth certain information relating to the Company’s cash dividends declared to common stockholders during fiscal years 2018 and 2017:
| Dividend Declaration Date |  | Dividend per Share |  | Total of Cash Dividends Declared |  | Date of Record for Dividend Payment |  | Dividend Cash Payment Date
| (in thousands, except for per share data)
Fiscal Year 2018: | October 19, 2017 |  | $ | 0.08 |  |  | $ | 14,588 |  |  | November 15, 2017 |  | December 1, 2017
| January 25, 2018 |  | $ | 0.08 |  |  | $ | 14,272 |  |  | February 15, 2018 |  | March 1, 2018
| April 19, 2018 |  | $ | 0.08 |  |  | $ | 13,991 |  |  | May 15, 2018 |  | June 1, 2018
| July 18, 2018 |  | $ | 0.08 |  |  | $ | 13,677 |  |  | August 15, 2018 |  | September 4, 2018
Fiscal Year 2017: | October 20, 2016 |  | $ | 0.08 |  |  | $ | 15,248 |  |  | November 15, 2016 |  | December 1, 2016
| January 26, 2017 |  | $ | 0.08 |  |  | $ | 15,051 |  |  | February 15, 2017 |  | March 1, 2017
| April 20, 2017 |  | $ | 0.08 |  |  | $ | 14,840 |  |  | May 15, 2017 |  | June 1, 2017
| July 20, 2017 |  | $ | 0.08 |  |  | $ | 14,698 |  |  | August 15, 2017 |  | September 1, 2017

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (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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