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Retirement Plans (Schedule of Cost of Retirement Plans) (detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 6,988	$ 5,424	$ 5,141
Interest cost	7,265	6,837	6,455
Expected return on plan assets	8,603	8,140	7,347
Amortization of net loss	(3,190)	(1,350)	(1,497)
Amortization of transition assets	0	(227)	(276)
Net periodic benefit cost	$ 8,840	$ 5,244	$ 5,470

X

- Definition

The amount of gains or losses recognized in net periodic benefit cost.

+ References

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-Name Statement of Financial Accounting Standard (FAS)

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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.

+ References

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-Glossary Expected Return on Plan Assets

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- 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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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.

+ References

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- 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.

+ References

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-Number 132R

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