Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 632	$ 830
Interest Cost	1,131	983
Expected Return on Plan Assets	(1,297)	(1,100)
Recognized Actuarial Losses	318	893
Amortization of Prior Service Costs	17	16
Net Periodic Pension Cost	801	1,622
SERP
Defined Benefit Plan Disclosure [Line Items]
Service Cost	183	204
Interest Cost	127	106
Recognized Actuarial Losses	66	94
Amortization of Prior Service Costs	105	105
Net Periodic Pension Cost	$ 481	$ 509