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Reconciliation of Income Taxes at Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Tax [Line Items]
United States statutory income tax expense (at 35%)	$ 80,581	$ 66,962	$ 53,005
State income taxes, net of federal effect	3,742	1,592	3,035
Nondeductible expenses, domestic manufacturing deduction and other	7,664	1,587	(1,848)
Effect of foreign operations	(27,883)	(20,028)	(14,841)
Valuation allowance	1,171	(2,821)	(1,333)
Income tax expense	$ 65,275	$ 47,292	$ 38,018

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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