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