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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Beginning of the period |  |  | $ 1,050,557 | $ 856,111
Other comprehensive income (loss) | $ (2,224) | $ 3,225 | (4,313) | 1,903
End of the period | 1,012,164 | 921,835 | 1,012,164 | 921,835
Total |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Beginning of the period |  |  | (93,455) | (100,706)
End of the period | (97,768) | $ (98,803) | (97,768) | $ (98,803)
Cumulative Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Beginning of the period |  |  | (83,848) |
Other comprehensive income (loss) |  |  | (7,826) |
End of the period | (91,674) |  | (91,674) |
Defined Benefit Plan |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Beginning of the period |  |  | (6,398) |
Other comprehensive income (loss) |  |  | (41) |
End of the period | (6,439) |  | (6,439) |
Deferred Hedging Losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Beginning of the period |  |  | (3,209) |
Other comprehensive income (loss) |  |  | 3,554 |
End of the period | $ 345 |  | $ 345 |

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