Differences Between Federal Statutory Income Tax Rate and Effective Tax Rates (Detail)	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Schedule Of Effective Tax Rates Line Items
Statutory income tax rate	34.00%	34.00%	34.00%
Credits	(15.30%)	(54.00%)	8.40%
Rate differential on foreign operations	9.70%	54.90%	(0.10%)
Permanent differences	(8.10%)	(46.20%)	0.30%
State taxes, net	(7.70%)	62.20%	(14.10%)
Change in valuation allowance	(2.00%)	(96.00%)	(33.80%)
Stock based compensation	0.40%	2.00%	(0.30%)
Expiry of state NOL carryforwards		78.90%	(2.60%)
Effective tax rate	11.00%	35.80%	(8.20%)

Effective Income Tax Rate Reconciliation, Permanent Differences

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 47

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to differences in the deductibility or nondeductibility of incentive stock options and other equity-based compensation costs in accordance with generally accepted accounting principles and enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate that can be explained by all tax credits generated or utilized under enacted tax laws during the period.

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