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Schedule of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension Plan and Supplemental Plan
Net Period Benefit Cost Assumptions [Line Items]
Service cost	$ 234	$ 206	$ 468	$ 412
Interest cost	935	968	1,870	1,936
Expected return on plan assets	(530)	(685)	(1,060)	(1,370)
Amortization of prior service cost	9	12	18	24
Recognized actuarial benefit	567	247	1,134	494
Net periodic benefit cost	1,215	748	2,430	1,496
Other Benefits
Net Period Benefit Cost Assumptions [Line Items]
Service cost	75	68	150	136
Interest cost	211	226	421	452
Amortization of prior service cost	(510)	(508)	(1,021)	(1,016)
Recognized actuarial benefit	(245)	(325)	(489)	(650)
Net periodic benefit cost	$ (469)	$ (539)	$ (939)	$ (1,078)

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Net Period Benefit Cost Assumptions [Line Items]

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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-Publisher FASB



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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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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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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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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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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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