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Retirement and Deferred Compensation Plan Deferred Compensation Plan (Details) - USD ($)
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accrued bonus and deferred compensation $ 25,076,000 $ 24,270,000  
Deferred Compensation Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Deferred Compensation Plan Assets 700,000 500,000  
Accrued bonus and deferred compensation 2,600,000 2,500,000  
Deferred Compensation Arrangement with Individual, Employer Contribution $ 227,000 $ 212,000 $ 215,000