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Foreign Currency Exchange Contracts and Hedging (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 09, 2018 USD ($) counterparty | Dec. 31, 2017 USD ($) counterparty | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) counterparty | Dec. 31, 2016 USD ($) | Mar. 31, 2017 USD ($)
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Gain (loss) reclassification from AOCI to income, estimate of time to transfer |  |  |  | 6 months |  |
Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Notional value |  | $ 62,549,000 |  | $ 62,549,000 |  |
Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Number of counterparties in derivative contracts | counterparty |  | 2 |  | 2 |  |
Maximum remaining maturity of foreign currency derivatives |  |  |  | 3 months |  |
Derivative, settled during period, notional amount |  | $ 50,997,000 |  | $ 83,807,000 |  |
Derivative, entered into and settled during period, notional amount |  |  |  | 13,471,000 |  |
Designated as Hedging Instrument | Derivatives designated as cash flow hedges |  |  |  |  |  |
Summary of the effect of derivative instruments on the consolidated statements of income |  |  |  |  |  |
Amount of (loss) gain reclassified from accumulated other comprehensive loss into income (effective portion) |  | (3,914,000) | $ 4,294,000 | (6,197,000) | $ 5,970,000 |
Amount of gain excluded from effectiveness testing |  | 273,000 | 142,000 | 1,045,000 | 497,000 |
Designated as Hedging Instrument | Derivatives designated as cash flow hedges | Foreign currency exchange contracts |  |  |  |  |  |
Summary of the effect of derivative instruments on the consolidated statements of income |  |  |  |  |  |
Amount of gain recognized in other comprehensive income (loss) on derivative instruments (effective portion) |  | $ 108,000 | 2,054,000 | $ (9,682,000) | 6,957,000 |
Not Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Number of counterparties in derivative contracts | counterparty |  | 5 |  | 5 |  |
Maximum remaining maturity of foreign currency derivatives |  |  |  | 3 months |  |
Derivative, entered into and settled during period, notional amount |  |  |  | $ 42,344,000 |  |
Summary of the effect of derivative instruments on the consolidated statements of income |  |  |  |  |  |
Amount of gain recognized in income on derivative instruments |  | $ 211,000 | $ 4,038,000 | (2,455,000) | $ 3,157,000 |
Subsequent Event | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Number of counterparties in derivative contracts | counterparty | 6 |  |  |  |  |
Subsequent Event | Designated as Hedging Instrument | Derivatives designated as cash flow hedges | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Notional value | $ 90,091,000 |  |  |  |  |
Subsequent Event | Not Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Notional value | $ 0 |  |  |  |  |
Maximum remaining maturity of foreign currency derivatives | 15 months |  |  |  |  |
Fair Value, Measurements, Recurring | Designated as Hedging Instrument |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Fair value recorded in other current assets |  |  |  |  |  | $ 1,365,000
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Derivatives designated as cash flow hedges |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Fair value recorded in other accrued expenses |  | (1,827,000) |  | (1,827,000) |  |
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Derivatives designated as cash flow hedges | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Notional value |  | 24,347,000 |  | 24,347,000 |  |
Fair value recorded in other current assets |  | 0 |  | 0 |  |
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Fair value recorded in other current assets |  | 130,000 |  | 130,000 |  |
Fair value recorded in other accrued expenses |  | (394,000) |  | (394,000) |  |
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Notional value |  | $ 38,202,000 |  | $ 38,202,000 |  |

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