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Condensed Consolidating Financial Information - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended 9 Months Ended
May. 31, 2015
May. 31, 2014
Aug. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]      
Increase (decrease) in cash provided by operating activities as a result of revision $ 28.4 $ (22.3) $ 34.1
Increase (decrease) in cash provided by financing activities as a result of revision (31.4) (36.1)  
Parent [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Increase (decrease) in cash provided by operating activities as a result of revision (5.9) (12.5)  
Increase (decrease) in cash provided by financing activities as a result of revision (9.9) (55.1)  
Guarantor Subsidiaries [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Increase (decrease) in cash provided by operating activities as a result of revision 27.4 (4.7)  
Increase (decrease) in cash provided by financing activities as a result of revision $ (18.1) 17.8  
Restatement Adjustment [Member] | Parent [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Increase (decrease) in cash provided by operating activities as a result of revision   (143.7)  
Increase (decrease) in cash provided by financing activities as a result of revision   143.7  
Restatement Adjustment [Member] | Guarantor Subsidiaries [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Increase (decrease) in cash provided by operating activities as a result of revision   143.7  
Increase (decrease) in cash provided by financing activities as a result of revision   $ (143.7)  
7.125% Second-Priority Senior Secured Notes [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Noncontrolling Interest, Ownership Percentage by Parent 100.00%