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Foreign Currency Exchange Contracts and Hedging (Narrative) (Details) - Foreign currency exchange contracts $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Nov. 09, 2016 USD ($) counterparty | Sep. 30, 2016 USD ($) counterparty | Sep. 30, 2016 USD ($) counterparty | Sep. 30, 2015 USD ($)
Derivatives designated as cash flow hedges |  |  |  |
Summary of the effect of derivative instruments on the consolidated statements of income |  |  |  |
Amount of gain (loss) recognized in other comprehensive income on derivatives (effective portion) |  |  | $ 4,903 | $ (1,498)
Amount of gain (loss) reclassified from accumulated other comprehensive income into income (effective portion) |  |  | 1,676 | (794)
Amount of gain excluded from effectiveness testing |  |  | 355 | 66
Designated as hedging instrument |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Derivative notional amount |  | $ 71,000 | $ 71,000 |
Number of counterparties in derivative contracts | counterparty |  | 7 | 7 |
Remaining maturity of foreign currency derivatives (in months) |  |  | 6 months |
Derivative, settled during period, notional amount |  | $ 41,000 | $ 44,000 |
Non-designated derivatives |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Derivative notional amount |  | $ 30,000 | $ 30,000 |
Number of counterparties in derivative contracts | counterparty |  | 4 | 4 |
Remaining maturity of foreign currency derivatives (in months) |  |  | 6 months |
Derivative, entered into and settled during period, notional amount |  | $ 61,000 | $ 124,000 |
Summary of the effect of derivative instruments on the consolidated statements of income |  |  |  |
Amount of loss recognized in income on derivatives |  |  | $ (881) | $ (461)
Non-designated derivatives | Subsequent event |  |  |  |
Foreign currency exchange contracts and hedging |  |  |  |
Derivative notional amount | $ 48,000 |  |  |
Number of counterparties in derivative contracts | counterparty | 9 |  |  |
Remaining maturity of foreign currency derivatives (in months) | 3 months |  |  |

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