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Debt - Additional Information (Detail)
€ in Millions
3 Months Ended 12 Months Ended
May. 27, 2015
EUR (€)
May. 11, 2015
USD ($)
Mar. 26, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Debt Instrument [Line Items]            
Short-term borrowings outstanding       $ 480,000   $ 1,021,000
Lines of credit       66,200,000   69,100,000
Increase in line of credit facility     $ 500,000,000      
Borrowings under the Term Facility       4,474,000   4,550,000
Interest expense, net       8,259,000 $ 2,677,000  
Interest expense, gross       8,800,000 3,100,000  
Non-cash portion of interest expense       700,000 500,000  
Cash portion of gross interest expense       8,100,000 2,600,000  
Interest income       $ 500,000 $ 400,000  
Letters of Credit [Member]            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity     $ 50,000,000      
Senior Notes [Member] | 4.150 Percent Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt instrument, aggregate principal amount   $ 400,000,000        
Debt instrument, interest rate   4.15%        
Debt instrument, maturity date       May 15, 2025    
Debt instrument, par value percentage   99.336%        
Debt discount to be amortized   $ 2,700,000   $ 2,571,000   2,626,000
Debt issuance cost to be amortized   3,800,000        
Proceeds from the issuance of debt   $ 393,500,000        
Effective interest rate   4.232%        
Senior Notes [Member] | 2.000 Percent Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt instrument, aggregate principal amount | € € 350.0          
Debt instrument, interest rate 2.00%          
Debt instrument, maturity date       May 27, 2022    
Debt instrument, par value percentage 99.613%          
Debt discount to be amortized € 1.4     $ 1,444,000   1,490,000
Debt issuance cost to be amortized | € 2.6          
Proceeds from the issuance of debt | € € 346.0          
Effective interest rate 2.06%          
Multi-Currency Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Unsecured revolving credit facility, period of agreement, in years     5 years      
Current borrowing capacity     $ 750,000,000      
Aggregate Commitment     $ 1,200,000,000      
Borrowings under the Term Facility       4,800,000   4,800,000
Unused available credit       937,100,000   912,100,000
Fees and other expenses       3,000,000   3,000,000
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Lines of credit       $ 258,100,000   $ 283,100,000