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Stock-based Compensation (Stock Options) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Income tax benefit (expense) from stock-based award | $ 1,208 | $ 839 | $ 891
Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding, Number of Shares | 130,065 |  |
Exercised, Number of Shares | (67,445) |  |
Outstanding, Number of Shares | 62,620 | 130,065 |
Exercisable, Number of Shares | 62,620 |  |
Outstanding, Weighted-Average Exercise Price | $ 33.07 |  |
Exercised, Weighted-Average Exercise Price | 31.30 |  |
Outstanding, Weighted-Average Exercise Price | 34.97 | $ 33.07 |
Exercisable, Weighted-Average Exercise Price | $ 34.97 |  |
Outstanding, Weighted-Average Remaining Contractual Term | 1 year 7 months 6 days |  |
Exercisable, Weighted-Average Remaining Contractual Term | 1 year 7 months 6 days |  |
Outstanding, Aggregate Intrinsic Value | $ 3,054 |  |
Exercisable, Aggregate Intrinsic Value | 3,054 |  |
Total intrinsic value of stock options exercised | 3,300 | $ 1,400 | 3,200
Income tax benefit (expense) from stock-based award | $ 1,100 | $ 400 | $ 900

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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