Schedule of Expected Recognized Periodic Pension Cost Related to Accumulated Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2013
Pension Plans
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Amortization of net actuarial loss	$ 1,143
Amortization of prior service costs	67
Total	1,210
SERP
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Amortization of net actuarial loss	262
Amortization of prior service costs	420
Total	$ 682

Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration