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Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 9,220 $ 7,928 $ 6,886
Charged to Costs & Expenses 3,738 7,514 6,481
Other Changes Add (Deduct) [1] (6,245) (6,222) (5,439)
Balance at End of Year $ 6,713 $ 9,220 $ 7,928
[1] Bad debts written off (net of recoveries).