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Commitments, Guarantees, and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Oct. 11, 2011
Jul. 31, 2014
Jul. 31, 2013
Commitments and Contingencies Disclosure [Line Items]      
Liabilities related to agreements   $ 0  
Deferred revenue for product extended warranty contracts   11.8 10.6
Revolving credit agreement period 5 years    
Business exit cost   1.4 1.2
Minimum
     
Commitments and Contingencies Disclosure [Line Items]      
Standard product warranty term   12 months  
Maximum
     
Commitments and Contingencies Disclosure [Line Items]      
Standard product warranty term   60 months  
Product Extended Warranty Contracts
     
Commitments and Contingencies Disclosure [Line Items]      
Deferred revenue for product extended warranty contracts   7.4 8.0
Other Liabilities
     
Commitments and Contingencies Disclosure [Line Items]      
Asset retirement obligations, estimated cost of restoring our leased facilities   1.1 1.0
Product Warranty | Minimum
     
Commitments and Contingencies Disclosure [Line Items]      
Standard product warranty term   12 months  
Product Warranty | Maximum
     
Commitments and Contingencies Disclosure [Line Items]      
Standard product warranty term   60 months  
Credit Agreement
     
Commitments and Contingencies Disclosure [Line Items]      
Credit facility, expiry date Oct. 10, 2016    
Leverage ratio   0.003%  
Credit facility transaction costs incurred   0.5  
Credit facility, maturity period   5 years  
Line of credit amount outstanding   0 0
Credit Agreement | Other Revolving Credit Facilities
     
Commitments and Contingencies Disclosure [Line Items]      
Credit facility available borrowing capacity   $ 4.4  
Credit Agreement | Minimum
     
Commitments and Contingencies Disclosure [Line Items]      
Credit facility commitment fee percentage 0.20%    
Interest coverage ratio   300.00%  
Credit Agreement | Maximum
     
Commitments and Contingencies Disclosure [Line Items]      
Credit facility commitment fee percentage 0.35%    
Leverage ratio of total debt to earnings before interest, taxes, depreciation, and amortization or EBITDA   275.00%  
Credit Agreement | Libor Rate | Minimum
     
Commitments and Contingencies Disclosure [Line Items]      
Variable interest rate 1.25%    
Credit Agreement | Libor Rate | Maximum
     
Commitments and Contingencies Disclosure [Line Items]      
Variable interest rate 2.00%    
Credit Agreement | Defined Base Rate | Minimum
     
Commitments and Contingencies Disclosure [Line Items]      
Variable interest rate 0.00%    
Credit Agreement | Defined Base Rate | Maximum
     
Commitments and Contingencies Disclosure [Line Items]      
Variable interest rate 1.00%