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Employee Benefit Plans (Details) (USD $)
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Percentage of employee gross salary matched by employer 4.00%    
Defined contribution plan recognized expenses $ 4,600,000 $ 3,400,000 $ 2,900,000
Pecentage of employee based salary permitted for deferral under the plan 50.00%    
Percentage of employee annual bonus permitted for deferral under the plan 100.00%    
Deferred compensation plan assets 2,100,000    
Deferred compensation recorded liability 800,000    
Cash Surrender value of life insurance 4,100,000    
Effect of one percentage point increase on accumulated postretirement benefit obligation 102,000    
Effect of one percentage point increase on service and interest cost 5,000    
Effect of one percentage point decrease on accumulated postretirement benefit obligation 53,000    
Effect of one percentage point decrease on service and interest cost $ 3,000    
Deferred Compensation [Member]
     
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Deferred compensation requisite service period on or after age 65 and the completion of at least 10 years of continuous employment    
Retiree Medical Plan [Member]
     
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Deferred compensation requisite service period 10 years of service and who are age 55 or older but less than 65