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Leases (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Aggregate rentals over the lease term including lease renewal options      
Gross rent expense $ 63,017 $ 53,484 $ 44,618
Sublease rent revenue (217) (181) (141)
Net rent expense $ 62,800 $ 53,303 $ 44,477