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Schedule - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Accounts Receivable Allowances [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 36,398 $ 20,335 $ 16,564
Charged to costs and expenses 13,328 6,100 5,851
Charged to other accounts 552 12,754 1,176
Deductions (16,441) (2,791) (3,256)
Ending Balance 33,837 36,398 20,335
Valuation Allowances on Net Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance 128,207 127,202 117,011
Charged to costs and expenses 24,040 12,725 23,199
Charged to other accounts   4,418 2,552
Deductions (40,082) (16,138) (15,560)
Ending Balance $ 112,165 $ 128,207 $ 127,202