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Employee Benefit Plans - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Jun. 30, 2013
Sep. 30, 2013
Jul. 01, 2012
Jul. 01, 2011
Compensation And Retirement Disclosure [Abstract]        
Retirement benefits based on years of service and compensation   5 years    
Expected cash contribution   $ 179,000    
Benefit payments from Restoration Plan   93,000    
Defined benefit plan, expected additional contribution   30,000    
Funded status of Pentegra Plan, percentage     101.20% 84.40%
Termination liability $ 14,000,000