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Income Taxes (Narrative) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012
Deferred tax asset reflecting the benefit of deductions from the exercise of stock options | $ 14,900,000 |
Operating loss carryforwards expiration years | March 31, 2014 through 2033 |
Excess tax deductions from stock option exercised | 52,400,000 |
Stock options exercised dates | 2006 through 2013 |
Expiration of other tax credit carryforwards | March 31, 2014 through 2033 |
Repatriated amount | 1,500,000 |
Federal and state deferred tax liability | 5,444,000 | 3,129,000
Minimum percentage of amount being realized upon ultimate settlement | 50.00% |
Unrecognized tax benefits that, if recognized, would result in a reduction of the Company's effective tax rate | 1,100,000 | 1,100,000
Austria [Member] |  |
Net operating loss carryforwards | 64,400,000 |
China [Member] |  |
Net operating loss carryforwards | 5,400,000 | 13,800,000
Federal [Member] |  |
Net operating loss carryforwards | 664,000,000 |
Research and development and other tax credit carryforwards | 8,100,000 |
State [Member] |  |
Net operating loss carryforwards | 292,000,000 |
Research and development and other tax credit carryforwards | 3,200,000 |
Power Quality Systems, Inc. [Member] |  |
Net operating loss carryforwards | $ 3,700,000 |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42, 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31917-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31958-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31931-109318 + Details
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