Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves
Balance at beginning of year	$ 5,519		$ 3,588		$ 6,368
Charged (credited) to costs and expenses	13,149		9,584		6,286
Other	(11,676)	[1]	(7,653)	[1]	(9,066)	[1]
Balance at end of year	$ 6,992		$ 5,519		$ 3,588

[1] Uncollectible accounts written off, net of recoveries