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Financing Arrangements - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2015
Dec. 31, 2014
Oct. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2011
Line of Credit Facility [Line Items]              
Revolving credit facility, maturity date   2019-12          
Borrowings under the revolving credit facility       $ 220,000,000 $ 210,000,000    
Payments under financing arrangements     $ 210,000,000 210,000,000 $ 200,000,000 $ 200,000,000  
Outstanding letters of credit and bank guarantees       $ 73,706,000      
Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Five-year revolving credit facility             $ 500,000,000
Revolving credit facility, maturity term       5 years      
Subsequent Event [Member]              
Line of Credit Facility [Line Items]              
Payments under financing arrangements $ 220,000,000