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Financial Risk Management and Derivatives (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018
Foreign Currency Exchange Contracts [Abstract] |  |  |
Forward foreign currency exchange contracts included in other current liabilities | $ 1,487,000 |  |
Forward foreign currency exchange contracts included in prepaid and other current assets |  |  | $ 1,179,000
Forward Foreign Currency Exchange Contracts [Member] |  |  |
Foreign Currency Exchange Contracts [Abstract] |  |  |
Notional amount of foreign currency derivatives | 32,016,000 |  | $ 31,304,000
Forward Foreign Currency Exchange Contracts [Member] | General and Administrative Expenses [Member] |  |  |
Foreign Currency Exchange Contracts [Abstract] |  |  |
Forward foreign currency exchange contracts | $ (2,666,000) | $ 1,052,000 |

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