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Stock-based Compensation (Tables) | 12 Months Ended
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Aug. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Stock Options Activity |
|  |  |  |  | Weighted-Average |  |
|  |  |  |  | Remaining |  |
|  |  | Weighted-Average |  | Contractual Term |  |
| Number of |  | Exercise Price |  | Per Share |  | Aggregate
Stock Options | Shares |  | Per Share |  | (in years) |  | Intrinsic Value
Outstanding at August 31, 2012 |  | 313,267 |  | $ | 33.12 |  |  |  |  |  |
Granted |  | - |  | $ | - |  |  |  |  |  |
Exercised |  | (144,676) |  | $ | 33.12 |  |  |  |  |  |
Forfeited or expired |  | - |  | $ | - |  |  |  |  |  |
Outstanding at August 31, 2013 |  | 168,591 |  | $ | 33.13 |  |  | 3.2 |  | $ | 4,223
Exercisable at August 31, 2013 |  | 168,591 |  | $ | 33.13 |  |  | 3.2 |  | $ | 4,223
Schedule of Share-based Compensation, Restricted Stock Units Activity |
|  |  | Weighted-Average |  |
|  |  | Grant Date |  |
| Number of |  | Fair Value |  | Aggregate
Restricted Stock Units | Shares |  | Per Share |  | Intrinsic Value
Outstanding at August 31, 2012 |  | 169,904 |  | $ | 36.03 |  |  |
Granted |  | 34,576 |  | $ | 45.45 |  |  |
Converted to common shares |  | (51,052) |  | $ | 35.73 |  |  |
Forfeited |  | (1,700) |  | $ | 38.67 |  |  |
Outstanding at August 31, 2013 |  | 151,728 |  | $ | 38.25 |  | $ | 8,828
Vested at August 31, 2013 |  | 85,613 |  | $ | 36.45 |  | $ | 4,981
Performance Share Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Performance Share Units Activity |
|  |  | Weighted-Average |  |
|  |  | Grant Date |  |
| Number of |  | Fair Value |  | Aggregate
Performance Share Units | Shares |  | Per Share |  | Intrinsic Value
Outstanding at August 31, 2012 |  | 41,180 |  | $ | 38.02 |  |  |
Granted |  | - |  | $ | - |  |  |
Converted to common shares |  | (11,520) |  | $ | 36.88 |  |  |
Forfeited |  | (12,480) |  | $ | 36.88 |  |  |
Outstanding at August 31, 2013 |  | 17,180 |  | $ | 39.61 |  | $ | 1,000
Expected to vest at August 31, 2013 |  | 13,315 |  | $ | 39.61 |  | $ | 775
Market Share Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Maket Share Units Activity |
|  |  | Weighted-Average |  |
|  |  | Grant Date |  |
| Number of |  | Fair Value |  | Aggregate
Market Share Units | Shares |  | Per Share |  | Intrinsic Value
Outstanding at August 31, 2012 |  | - |  | $ | - |  |  |
Granted |  | 24,393 |  | $ | 37.15 |  |  |
Converted to common shares |  | - |  | $ | - |  |  |
Forfeited |  | (162) |  | $ | 29.85 |  |  |
Outstanding at August 31, 2013 |  | 24,231 |  | $ | 37.20 |  | $ | 1,410
Schedule of Share-based Payment Award, Valuation Assumptions |
| Fiscal Year Ended August 31, 2013
Expected volatility | 25.4%
Risk-free interest rate | 0.4%
Expected dividend yield | 0%

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the number, aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both performance-based awards (or share units) outstanding and performance-based awards (or share units) fully vested and expected to vest at the date of the latest statement of financial position. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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