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Employee Benefit Plans - Net Periodic Pension Cost for Defined Benefit Pension Plans (Detail) (Net Periodic Benefit Cost [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Pension and Deferred Compensation Benefits [Member]
Components of net periodic benefit cost:
Service cost	$ 2,403	$ 2,689	$ 2,479
Interest cost	11,436	11,239	8,515
Expected return on assets	(9,112)	(8,835)	(6,063)
Amortization of prior service cost	72		535
Amortization of transition obligation			207
Recognized net actuarial (gain) loss	855	8	613
Net periodic cost (benefit)	5,654	5,101	6,286
Other Benefits [Member]
Components of net periodic benefit cost:
Service cost	12	11	9
Interest cost	27	27	26
Recognized net actuarial (gain) loss	(54)	(52)	(58)
Net periodic cost (benefit)	$ (15)	$ (14)	$ (23)

X

- Definition

Amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The amount of the transition obligation or asset recognized in net periodic benefit cost.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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X

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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X

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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