v2.4.0.6

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

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