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Employee Benefit Plan (Detail) (Pension Plans, Defined Benefit, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Pension Plans, Defined Benefit
       
Components of net periodic benefit cost:        
Service cost            
Interest cost 620 714 1,240 1,428
Expected return on plan assets (948) (941) (1,896) (1,882)
Net amortization 664 688 1,328 1,376
Net periodic benefit cost $ 336 $ 461 $ 672 $ 922