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Capital Stock Share Repurchases - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 | Aug. 31, 2021 | Mar. 16, 2015 | Oct. 01, 2014 | Mar. 29, 2014 | Sep. 28, 2011
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 | 82,593,945 | 83,021,654 |  |  |  |
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 | 7,000,000 | 7,000,000 | 7,000,000
Treasury stock, shares | 22,799,230 | 22,799,230 |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  | 5,200,770 |  |  |  |
Stock Repurchased During Period, Shares | 1,343,662 |  |  |  |  |
Stock Repurchased During Period, Value | $ 27.5 |  |  |  |  |
Common Class A |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  | 168,000,000 |  |  |  |
Common stock, par value |  | $ 0.20 |  |  |  |
Common stock, shares issued |  | 83,021,654 |  |  |  |
Common stock, shares outstanding |  | 60,222,424 |  |  |  |
Common Class B |  |  |  |  |  |
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 |  |  |  |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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