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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015
Deferred tax asset reflecting the benefit of deductions from the exercise of stock options | $ 13,000,000 |
Excess tax deductions from stock option exercised | $ 52,500,000 |
Stock options exercised dates | March 31, 2006 through 2016 |
Undistributed earnings available for repatriation | $ 1,200,000 |
Uncertain tax positions | 0 |
Unrecognized tax benefits that, if recognized, would result in a reduction of the Company's effective tax rate | 0 | $ 0
Austria |  |
Net operating loss carryforwards | $ 42,600,000 |
China |  |
Operating loss carryforwards expiration years | Dec. 31, 2016 |
Net operating loss carryforwards | $ 32,000,000 |
Net operating loss carryforward period | 5 years |
China | Earliest Tax Year |  |
Income tax year under examination | 2013 |
China | Latest Tax Year |  |
Income tax year under examination | 2014 |
Romania |  |
Operating loss carryforwards expiration years | Mar. 31, 2023 |
Net operating loss carryforwards | $ 500,000 |
Federal |  |
Net operating loss carryforwards | 791,000,000 |
Research and development and other tax credit carryforwards | 9,300,000 |
State |  |
Net operating loss carryforwards | 177,000,000 |
Research and development and other tax credit carryforwards | 2,900,000 |
Foreign Earnings Repatriated |  |
Federal and state deferred tax liability | 400,000 |
Power Quality Systems, Inc. |  |
Net operating loss carryforwards | $ 3,700,000 |
Maximum |  |
Operating loss carryforwards expiration years | Mar. 31, 2036 |
Expiration of other tax credit carryforwards | Mar. 31, 2036 |
Maximum | Austria |  |
Open tax year | 2016 |
Maximum | China |  |
Open tax year | 2012 |
Maximum | Romania |  |
Open tax year | 2016 |
Maximum | U.S |  |
Open tax year | 2016 |
Minimum |  |
Operating loss carryforwards expiration years | Mar. 31, 2017 |
Expiration of other tax credit carryforwards | Mar. 31, 2017 |
Minimum | Austria |  |
Open tax year | 2012 |
Minimum | China |  |
Open tax year | 2008 |
Minimum | Romania |  |
Open tax year | 2014 |
Minimum | U.S |  |
Open tax year | 1995 |

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