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Foreign Currency Exchange Contracts and Hedging (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) counterparty | Jun. 30, 2017 USD ($) | Aug. 03, 2018 USD ($) | Mar. 31, 2018 USD ($)
Foreign currency exchange contracts and hedging |  |  |  |
Gain (loss) reclassification from AOCI to income, estimate of time to transfer | 12 months |  |  |
Foreign currency exchange contracts |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Number of counterparties in derivative contracts | counterparty | 5 |  |  |
Maximum remaining maturity of foreign currency derivatives | 9 months |  |  |
Designated as Hedging Instrument |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Derivative entered into and settled during period | $ 0 |  |  |
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 gain (loss) on derivative instruments (effective portion) recognized in other comprehensive loss | 6,770,000 | $ (5,890,000) |  |
Amount of gain excluded from effectiveness testing recognized in SG&A expenses | 846,000 | 333,000 |  |
Not Designated as Hedging Instrument |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Derivative, settled during period, notional amount | $ 0 |  |  |
Not Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Maximum remaining maturity of foreign currency derivatives | 9 months |  |  |
Summary of the effect of derivative instruments on the consolidated statements of income |  |  |  |
Amount of gain (loss) on derivative instruments recognized in SG&A expenses | $ 487,000 | $ (1,603,000) |  |
Not Designated as Hedging Instrument | Derivatives designated as cash flow hedges | Foreign currency exchange contracts |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Notional value | 14,000,000 |  |  |
Subsequent Event | Designated as Hedging Instrument | Derivatives designated as cash flow hedges | Foreign currency exchange contracts |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Notional value |  |  | $ 0 |
Subsequent Event | Not Designated as Hedging Instrument | Derivatives designated as cash flow hedges | Foreign currency exchange contracts |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Notional value |  |  | $ 0 |
Fair Value, Measurements, Recurring |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Fair value recorded in other current assets | 8,660,000 |  |  |
Fair Value, Measurements, Recurring | Foreign currency exchange contracts |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Notional value | 145,134,000 |  |  |
Fair Value, Measurements, Recurring | Designated as Hedging Instrument |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Fair value recorded in other current assets | 8,182,000 |  |  | $ 950,000
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 | 126,332,000 |  |  |
Fair value recorded in other current assets | 8,182,000 |  |  |
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Fair value recorded in other current assets | 478,000 |  |  |
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Notional value | $ 18,802,000 |  |  |

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