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Stockholders' Equity and Noncontrolling Interests - Components of Accumulated Other Comprehensive Income (Details) $ in Thousands | 6 Months Ended
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Sep. 30, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Beginning balance | $ 1,201,111
Ending balance | 1,202,802
Pension funded status adjustment |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Beginning balance | 22,503
Before Reclassifications | 0
Amounts Reclassified from AOCI | (600)
Ending balance | 21,903
Net unrealized gain (loss) on derivative instruments |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Beginning balance | (3,425)
Before Reclassifications | 7,869
Amounts Reclassified from AOCI | 2,695
Ending balance | (8,599)
Foreign currency translation adjustment |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Beginning balance | (15,789)
Before Reclassifications | 85,591
Amounts Reclassified from AOCI | 0
Ending balance | (101,380)
Accumulated other comprehensive (loss) income |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Beginning balance | (41,717)
Before Reclassifications | (93,460)
Amounts Reclassified from AOCI | 3,295
Ending balance | $ (131,882)

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