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Leases (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Aggregate rentals over the lease term including lease renewal options
Gross rent expense	$ 46,710	$ 39,394	$ 35,005
Sublease rent revenue	(141)	(132)	(81)
Net rent expense	$ 46,569	$ 39,262	$ 34,924

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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