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Accumulated Other Comprehensive Loss (Components of AOCI) (Details) - USD ($)
6 Months Ended 12 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Components of Accumulated Other Comprehensive Loss $ 895,966,000 $ 822,549,000
Reclassification from accumulated other comprehensive loss into earnings 0 0
Cumulative translation adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Components of Accumulated Other Comprehensive Loss (22,265,000) (26,100,000)
Unrecognized net loss on pension plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Components of Accumulated Other Comprehensive Loss (251,000) (252,000)
Accumulated other comprehensive loss, net of tax    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Components of Accumulated Other Comprehensive Loss $ (22,516,000) $ (26,352,000)