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Stock-based Compensation (Deferred Performance Units) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 14, 2014 | Aug. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted, Shares price | $ 75.14 |
Deferred Performance Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted, Number of Shares | 30,798 |
Fair market value | $ 2.3 |
Converted to common shares, Number of Shares |  | 0
Outstanding, Aggregate Intrinsic Value |  | $ 2.6
Minimum [Member] | Deferred Performance Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percent of original target number of vested shares |  | 0.00%
Maximum [Member] | Deferred Performance Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percent of original target number of vested shares |  | 100.00%

X
- Definition The total fair value of shares issued during the period under a deferred compensation arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References No definition available. + Details
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