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Retirement Plans - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Mar. 31, 2013
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Mar. 31, 2012
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Mar. 31, 2011
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Extended terms of return on portfolio investment, minimum | 3 years | ||
| Extended terms of return on portfolio investment, maximum | 5 years | ||
| Expected cash contributions to pension plans in 2014 | $ 2,226 | ||
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Defined Contribution Pension
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Employer expenses | $ 5,191 | $ 5,146 | $ 5,025 |
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Equity Securities
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Equity investments target range, minimum | 50.00% | ||
| Equity investments target range, maximum | 70.00% | ||