Annual report pursuant to Section 13 and 15(d)

Employee benefit plans and deferred compensation (Details)

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Employee benefit plans and deferred compensation (Details) (USD $)
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Employee benefit plans and deferred compensation      
Employer contribution to 401(k) plans $ 3,000,000 $ 3,000,000 $ 3,200,000
Deferred compensation plan assets, cash and cash equivalents 1,500,000    
Asset related to life insurance assets, which are held at cash surrender value 9,220,000 8,004,000  
Deferred compensation plan liabilities $ 12,400,000