Schedule - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Accounts Receivable Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 33,837	$ 36,398	$ 20,335
Charged to costs and expenses	24,004	13,328	6,100
Charged to other accounts	1,415	552	12,754
Deductions	(19,744)	(16,441)	(2,791)
Ending Balance	39,512	33,837	36,398
Valuation Allowances on Net Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	112,165	128,207	127,202
Charged to costs and expenses	13,800	24,040	12,725
Charged to other accounts	826		4,418
Deductions	(29,921)	(40,082)	(16,138)
Ending Balance	$ 96,870	$ 112,165	$ 128,207

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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