Quarterly report pursuant to Section 13 or 15(d)

Contingencies and Litigation - Additional Information (Details)

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Contingencies and Litigation - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
May. 31, 2015
Aug. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations and Divestiture Activities[Line Items]    
Outstanding letters of credit $ 16.4 $ 14.0
Litigation Settlement, Expense 3.0  
Discounted present value of future minimum lease payments 18.5  
Electrical    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations and Divestiture Activities[Line Items]    
Discounted present value of future minimum lease payments $ 13.7