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Fair Value Measurements (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Forward Foreign Currency Exchange Contracts [Member] | Sep. 30, 2012 Forward Foreign Currency Exchange Contracts [Member] | Sep. 30, 2013 Forward Foreign Currency Exchange Contracts [Member] | Sep. 30, 2012 Forward Foreign Currency Exchange Contracts [Member] | Sep. 30, 2013 Warrant Liability [Member] | Sep. 30, 2012 Warrant Liability [Member] | Sep. 30, 2013 Warrant Liability [Member] | Sep. 30, 2012 Warrant Liability [Member] | Sep. 30, 2013 Cerberus Warrant [Member] | Sep. 30, 2013 Supplier Warrant [Member] | Sep. 30, 2013 Recurring [Member] | Mar. 31, 2013 Recurring [Member] | Sep. 30, 2013 Recurring [Member] Level 1 [Member] | Mar. 31, 2013 Recurring [Member] Level 1 [Member] | Sep. 30, 2013 Recurring [Member] Level 2 [Member] | Mar. 31, 2013 Recurring [Member] Level 2 [Member] | Sep. 30, 2013 Recurring [Member] Level 3 [Member] | Mar. 31, 2013 Recurring [Member] Level 3 [Member]
Short-term Investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 452,000 | $ 411,000 | $ 452,000 | $ 411,000 | $ 0 | $ 0 | $ 0 | $ 0
Prepaid expenses and other current assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward foreign currency exchange contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 683,000 | 0 | 0 | 0 | 683,000 | 0 | 0
Other current liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 452,000 | 411,000 | 452,000 | 411,000 | 0 | 0 | 0 | 0
Forward foreign currency exchange contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000 | 0 | 0 | 0 | 150,000 | 0 | 0 | 0
Other liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,975,000 | 2,014,000 | 0 | 0 | 0 | 0 | 5,975,000 | 2,014,000
Net gain (loss) on forward foreign currency exchange contracts |  |  |  |  | (100,000) | 431,000 | (833,000) | 340,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions of warrants [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk free interest rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 0.88% | 1.01% |  |  |  |  |  |  |  |
Expected life |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 7 months 24 days | 4 years |  |  |  |  |  |  |  |
Expected volatility (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 44.19% | 43.10% |  |  |  |  |  |  |  |
Dividend yield (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |
Probability of future financing (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |
Change in warrant liability measured at fair value recurring basis using significant unobservable inputs (Level 3) [Rollforward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | 3,584,000 | 617,000 | 2,014,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newly issued | 0 | 1,018,000 | 0 | 1,625,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total loss (gain) included in net loss | 2,391,000 | (67,000) | 3,961,000 | (57,000) |  |  |  |  | 2,391,000 | (67,000) | 3,961,000 | (57,000) |  |  |  |  |  |  |  |  |  |
Warrants exercised | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net transfers in (out) of Level 3 | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance | $ 5,975,000 | $ 1,568,000 | $ 5,975,000 | $ 1,568,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of warrant liability as of the balance sheet date. + References No definition available. + Details
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