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
Valuation And Qualifying Accounts
Balance at beginning of year	$ 18,552		$ 17,217		$ 17,181
Charged (credited) to costs and expenses	26,403		16,477		15,088
Other	(27,274)	[1]	(15,142)	[1]	(15,052)	[1]
Balance at end of year	$ 17,681		$ 18,552		$ 17,217

[1] Uncollectible accounts written off, net of recoveries.