Valuation and Qualifying Accounts (Details) - Allowance For Doubtful Accounts Member - 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 period		$ 23,992	$ 20,624	$ 9,425
Charged to costs & expenses		15,082	19,491	14,484
Charged to other accounts		0	0	0
Valuation Allowances and Reserves, Deductions	[1]	23,791	16,123	3,285
Balance at end of period		$ 15,283	$ 23,992	$ 20,624

[1] Uncollectible accounts written off.