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Schedule of Expected Amounts of Net Periodic Benefit Costs (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost (benefit)	$ (1,103)	$ (1,648)
Pension Plans, Defined Benefit | Next Fiscal Year
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial loss	(976)
Unrecognized prior service cost (benefit)	(50)
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost (benefit)	395
Other Pension Plans, Defined Benefit | Next Fiscal Year
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost (benefit)	$ 2,032

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration