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Capital Stock - Additional Information (Detail) (USD $)
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12 Months Ended | |||
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Aug. 31, 2013
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Aug. 31, 2012
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Aug. 31, 2011
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Sep. 28, 2011
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| Capital Unit [Line Items] | ||||
| Cumulative Preferred Stock, shares authorized share | 160,000 | |||
| Cumulative Preferred Stock, par value | $ 1.00 | |||
| Cumulative Preferred Stock, issued | 0 | |||
| Shares authorized in buyback program | 7,000,000 | |||
| Shares repurchased | 3,983,513 | 2,658,751 | ||
| Anti-dilutive securities-equity based compensation plans (excluded from earnings per share calculation) | 619,000 | 2,582,000 | 2,582,000 | |
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Common Class A
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| Capital Unit [Line Items] | ||||
| Common stock, shares authorized | 168,000,000 | 168,000,000 | ||
| Common stock, par value | $ 0.20 | $ 0.20 | ||
| Common stock, shares issued | 77,001,144 | 75,519,079 | ||
| Common stock, shares outstanding | 73,017,631 | |||
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Common Class B
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| Capital Unit [Line Items] | ||||
| Common stock, shares authorized | 1,500,000 | |||
| Common stock, par value | $ 0.20 | |||
| Common stock, shares issued | 0 | |||
| Common stock, shares outstanding | 0 | |||
| X | ||||||||||
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- Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. No definition available.
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| X | ||||||||||
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- Definition
Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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