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Significant Assumptions Used to Determine Projected Benefit Obligations (Detail)
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Mar. 31, 2013
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Mar. 31, 2012
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|---|---|---|
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United States Plans
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Discount rate | 4.00% | 4.80% |
| Expected return on plan assets | 8.00% | 8.00% |
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International Plans | Minimum
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Discount rate | 2.50% | 2.50% |
| Expected return on plan assets | 4.00% | 5.50% |
| Rate of compensation increase | 2.00% | 2.00% |
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International Plans | Maximum
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Discount rate | 4.40% | 5.50% |
| Expected return on plan assets | 7.00% | 7.00% |
| Rate of compensation increase | 4.00% | 4.00% |