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Financial Risk Management and Derivatives (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019
Foreign Currency Exchange Contracts [Abstract] |  |  |  |  |
Forward foreign currency exchange contracts included in other current liability | $ 421,000 |  | $ 421,000 |  |
Forward foreign currency exchange contracts included in prepaid and other current assets |  |  |  |  | $ 207,000
Forward Foreign Currency Exchange Contracts [Member] |  |  |  |  |
Foreign Currency Exchange Contracts [Abstract] |  |  |  |  |
Notional amount of foreign currency derivatives | 36,791,000 |  | 36,791,000 |  | $ 32,524,000
Forward Foreign Currency Exchange Contracts [Member] | General and Administrative Expenses [Member] |  |  |  |  |
Foreign Currency Exchange Contracts [Abstract] |  |  |  |  |
Forward foreign currency exchange contracts | $ (663,000) | $ 1,898,000 | $ (628,000) | $ (768,000) |
Forward Foreign Currency Exchange Contracts [Member] | Maximum [Member] |  |  |  |  |
Foreign Currency Exchange Contracts [Abstract] |  |  |  |  |
Derivative, term of contract |  |  |  |  | 1 year

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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