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Foreign Currency Exchange Contracts and Hedging (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 09, 2017 USD ($) counterparty | Sep. 30, 2017 USD ($) counterparty | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) counterparty | Sep. 30, 2016 USD ($) | Mar. 31, 2017 USD ($)
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Gain (loss) reclassification from AOCI to income, estimate of time to transfer |  |  |  | 9 months |  |
Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Notional amount |  | $ 165,504,000 |  | $ 165,504,000 |  |
Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Number of counterparties in derivative contracts | counterparty |  | 4 |  | 4 |  |
Derivative, entered into and settled during period, notional amount |  | $ 32,810,000 |  |  |  |
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) |  | (2,283,000) | $ 1,851,000 | $ (2,283,000) | $ 1,676,000 |
Amount of gain excluded from effectiveness testing |  | 439,000 | 163,000 | 772,000 | 355,000 |
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 (loss) gain recognized in other comprehensive income (loss) on derivative instruments (effective portion) |  | $ (3,900,000) | 439,000 | $ (9,790,000) | 4,903,000 |
Not Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Number of counterparties in derivative contracts | counterparty |  | 6 |  | 6 |  |
Summary of the effect of derivative instruments on the consolidated statements of income |  |  |  |  |  |
Amount of loss recognized in income on derivative instruments |  | $ (1,065,000) | $ (290,000) | $ (2,668,000) | $ (881,000) |
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 amount | $ 0 |  |  |  |  |
Subsequent Event | Not Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Notional amount | $ 3,112,000 |  |  |  |  |
Maximum remaining maturity of foreign currency derivatives | 4 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 current liabilities |  | (5,583,000) |  | (5,583,000) |  |
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 amount |  | 88,815,000 |  | 88,815,000 |  |
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 |  | 509,000 |  | 509,000 |  |
Fair value recorded in other current liabilities |  | (3,177,000) |  | (3,177,000) |  |
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Notional amount |  | $ 76,689,000 |  | $ 76,689,000 |  |
Minimum | Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Maximum remaining maturity of foreign currency derivatives |  |  |  | 3 months |  |
Minimum | Not Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Maximum remaining maturity of foreign currency derivatives |  |  |  | 3 months |  |
Maximum | Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Maximum remaining maturity of foreign currency derivatives |  |  |  | 6 months |  |
Maximum | Not Designated as Hedging Instrument | Foreign currency exchange contracts |  |  |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |  |  |
Maximum remaining maturity of foreign currency derivatives |  |  |  | 6 months |  |

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