Summary Changes in Plan Assets and Benefit Obligations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Changes in plan assets and benefit obligations:
New prior service cost			$ 905
Net loss (gain) arising during the year	6,376	7,757	(3,505)
Effect of exchange rates on amounts included in AOCI	(392)	(176)	151
Amounts recognized as a component of net periodic benefit costs:
Amortization of prior service cost	(79)	(83)	(62)
Amortization or settlement recognition of net loss	(523)	(187)	(250)
Total recognized in other comprehensive income	$ 5,382	$ 7,311	$ (2,761)

The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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