Valuation and Qualifying Accounts (Details) (Allowance For Doubtful Accounts Member, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2010
Allowance For Doubtful Accounts Member
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 20,624		$ 9,425				$ 7,440
Charged to costs & expenses	19,491		14,484		8,901
Charged to other accounts	0		0		0
Valuation Allowances And Reserves Deductions	16,123	[1]	3,285	[1]	6,916	[1]
Balance at end of period	$ 23,992		$ 20,624		$ 9,425		$ 7,440

[1] Uncollectible accounts written off.