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Stockholders' Equity (Tables) | 12 Months Ended
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Aug. 31, 2017
Stockholders' Equity [Abstract] |
Schedule Of Recognized Stock Based Compensation Expense [Table Text Block] |
| The Company recognized stock-based compensation expense within selling, general and administrative expense as follows
(in thousands):
|  |  |  | Fiscal Year Ended August 31, |
|  |  |  | 2017 |  | 2016 |  | 2015 |
|  | Restricted stock and stock appreciation rights ("SARS") | $ | 42,122 |  | $ | 52,459 |  | $ | 58,033 |
|  | Employee stock purchase plan |  | 6,334 |  |  | 6,538 |  |  | 4,717 |
|  | Other |  | 88 |  |  | ― |  |  | (187) |
|  |  | Total | $ | 48,544 |  | $ | 58,997 |  | $ | 62,563 |
Schedule Of Shares Available For Issuance [Table Text Block] | Following is a reconciliat ion of the shares available to be issued under the 2011 Plan as of August 31, 2017:
|  |  |  | Shares Available for Grant |
Balance as of August 31, 2016 | 4,898,739 |
| Shares authorized (1) | 4,950,000 |
| SARS canceled | 1,357,386 |
| Restricted stock awards forfeited, net of grants(2) | 1,022,811 |
Balance as of August 31, 2017 | 12,228,936 |
(1) | In January 2017, the Company’s stockholders approved increasing the maximum aggregate number of shares available for
| issuance under the 2011 Plan to 23,300,000.
(2) | 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, 2016 through August 31, 2017: |  |
|  |  |  |  |  |  |  |  |  |  |  | Weighted-
|  |  |  |  |  |  |  |  | Weighted- |  | Average
|  |  |  |  |  | Average |  | Average |  | Remaining
|  |  |  | SARS |  | Intrinsic Value |  | Exercise |  | Contractual
|  |  |  | Outstanding |  | (in thousands) |  | Price |  | Life (years)
Outstanding as of August 31, 2016 | 2,439,066 |  | $ | 1,066 |  | $ | 25.32 |  | 1.13
| SARS canceled | (1,357,386) |  |  |  |  | $ | 29.15 |  |
| SARS exercised | (762,439) |  |  |  |  | $ | 20.78 |  |
Outstanding and exercisable as of August 31, 2017 | 319,241 |  | $ | 3,651 |  | $ | 19.91 |  | 2.10
Restricted Stock Activity |
| The following table summarizes restricted stock activity from August 31, 2016 through August 31, 2017: |
|  |  |  |  |  |  | Weighted- |
|  |  |  |  |  |  | Average |
|  |  |  |  |  |  | Grant-Date |
|  |  |  |  | Shares |  | Fair Value |
|  |  | Outstanding as of August 31, 2016 | 14,777,178 |  | $ | 21.09 |
|  |  | Changes during the period |  |  |  |  |
|  |  |  | Shares granted(1) | 3,507,690 |  | $ | 23.65 |
|  |  |  | Shares vested | (2,102,049) |  | $ | 20.94 |
|  |  |  | Shares forfeited | (4,530,500) |  | $ | 20.84 |
|  |  | Outstanding as of August 31, 2017 | 11,652,319 |  | $ | 22.00 |
(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, 2017, the Company awarded approximately 1.8 million time-based restricted stock units, 0.6 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 [TableTextBlock] |
| Following represents the restricted stock and SARS stock-based compensation information for the periods indicated (in thousands):
|  |  |  | Fiscal Year Ended August 31, |
|  |  |  | 2017 |  | 2016 |  | 2015 |
|  | Intrinsic value of SARS exercised | $ | 5,053 |  | $ | 506 |  | $ | 954 |
|  | Fair value of SARS vested | $ | ― |  | $ | ― |  | $ | 2,754 |
|  | Fair value of restricted stock vested | $ | 44,010 |  | $ | 34,857 |  | $ | 33,413 |
|  | Tax benefit (expense) for stock compensation expense(1) | $ | 560 |  | $ | 991 |  | $ | (351) |
|  | Capitalized stock compensation expense(2) | $ | 313 |  | $ | 387 |  | $ | 387 |
|  | Unrecognized stock-based compensation expense - restricted stock | $ | 45,158 |  |  |  |  |  |  |
|  | Remaining weighted-average period for restricted stock expense |  | 1.4 | years |  |  |  |  |  |
(1) | Classified as income tax expense within the Consolidated Statements of Operations. |
(2) | Classified as inventories within the Consolidated Balance Sheets. |
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, |  |
|  |  |  | 2017 |  |  | 2016 |  |  | 2015 |  |
|  |  | Expected dividend yield | 0.8 | % |  | 0.7 | % |  | 0.8 | % |
|  |  | Risk-free interest rate | 0.5 | % |  | 0.3 | % |  | 0.1 | % |
|  |  | Expected volatility (1) | 33.0 | % |  | 28.1 | % |  | 24.5 | % |
|  |  | 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 2017 and 2016:
|  |  |  |  |  |  | Total of Cash |  |  |  |
|  | Dividend |  | Dividend |  | Dividends |  | Date of Record for |  | Dividend Cash
|  | Declaration Date |  | per Share |  | Declared |  | Dividend Payment |  | Payment Date
|  | (in thousands, except for per share data)
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
Fiscal year 2016: | October 14, 2015 |  | $ | 0.08 |  | $ | 15,906 |  | November 16, 2015 |  | December 1, 2015
|  | January 21, 2016 |  | $ | 0.08 |  | $ | 15,947 |  | February 16, 2016 |  | March 1, 2016
|  | April 21, 2016 |  | $ | 0.08 |  | $ | 15,940 |  | May 16, 2016 |  | June 1, 2016
|  | July 21, 2016 |  | $ | 0.08 |  | $ | 15,575 |  | August 15, 2016 |  | September 1, 2016

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