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Accumulated Other Comprehensive Loss (Components of AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Components of Accumulated Other Comprehensive Loss | $ 1,178,610 | $ 822,549 | $ 744,336 | $ 627,624
Reclassification from AOCI | 0 | 0 |  |
Accumulated other comprehensive loss, net of tax |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Components of Accumulated Other Comprehensive Loss | (19,315) | (26,352) | $ (23,525) | $ (23,412)
Cumulative translation adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Components of Accumulated Other Comprehensive Loss | (20,398) | (26,100) |  |
Unrecognized net gain (loss) on pension plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Components of Accumulated Other Comprehensive Loss | $ 1,083 | $ (252) |  |

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