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Financial Risk Management and Derivatives (Details) (USD $) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2012 Forward Foreign Currency Exchange Contracts [Member] General and Administrative Expenses [Member] | Dec. 31, 2011 Forward Foreign Currency Exchange Contracts [Member] General and Administrative Expenses [Member] | Dec. 31, 2012 Forward Foreign Currency Exchange Contracts [Member] General and Administrative Expenses [Member] | Dec. 31, 2011 Forward Foreign Currency Exchange Contracts [Member] General and Administrative Expenses [Member]
Financial Risk Management and Derivatives [Abstract] |  |  |  |  |  |
Notional amount of foreign currency derivatives | $ 16,708,000 | $ 13,494,000 |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Forward foreign currency exchange contracts |  |  | 20,000 | 488,000 | 360,000 | (1,399,000)
Forward foreign currency exchange contracts included in prepaid expenses and other current assets | 239,000 |  |  |  |  |
Forward foreign currency exchange contracts included in other current liabilities |  | $ 121,000 |  |  |  |

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- Definition Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 -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 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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