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Description of Business and Summary of Significant Accounting Policies (Details 1) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Maturity period of highly liquid instruments | 90 days |  |
Cash equivalents outstanding | $ 71.5 | $ 22.4 |
Allowance for doubtful accounts | 14.1 | 11.1 |
Net tax benefit (expense) of foreign currency translation adjustment component of accumulated other comprehensive income | 0.0 | 0.0 |
Net tax benefit (expense) for unrealized gains on derivative instruments | (1.9) | (4.0) |
Accumulated tax benefit (expense) on unrealized loss on derivative instruments | 13.4 | 15.3 |
Net tax benefit (expense) of actuarial loss (gain) included in accumulated other comprehensive income | (1.0) | 0.6 |
Net tax benefit (expense) of prior service cost included in accumulated other comprehensive income | (0.3) | (0.3) |
Net tax benefit (expense) of available for sale securities component of AOCI | 0.0 | $ 0.0 |
Senior Non-Convertible Cumulative Preferred Stock | $ 49.8 |  |
Stock Options [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Common shares excluded from computation of diluted earnings per share |  |  | 218
Stock Appreciation Rights [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Common shares excluded from computation of diluted earnings per share | 265 | 2,381 | 3,585

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- Definition Net tax benefit (expense) of actuarial losses (gains) recorded in accumulated other comprehensive income associated with the Company's defined benefit pension and other post-retirement benefit plans. + References No definition available. + Details
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