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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2017 $ 17,073    
2018 16,824    
2019 15,450    
2020 14,479    
2021 14,335    
Operating Leases, Thereafter 47,714    
Total Operating Lease Payments 125,875    
Lease and Rental Expense $ 32,600 $ 32,500 $ 31,700
Minimum [Member]      
Operating Leased Assets [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 1 year    
Maximum [Member]      
Operating Leased Assets [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 18 years