Valuation and Qualifying Accounts (Details) (Allowance For Doubtful Accounts Member, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Allowance For Doubtful Accounts Member
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 7,440	$ 12,701	$ 11,478
Charged to costs & expenses	8,901	2,201	7,694
Charged to other accounts	0	0	0
Valuation Allowances And Reserves Deductions	6,916	7,462	6,471
Balance at end of period	$ 9,425	$ 7,440	$ 12,701