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Accumulated Other Comprehensive Loss (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss $ 1,101,623,000 $ 1,095,831,000 $ 1,161,723,000 $ 1,178,610,000
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 (27,102,000) (26,878,000)    
Unrecognized net gain on pension plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss 1,131,000 1,131,000    
Accumulated other comprehensive loss, net of tax        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of accumulated other comprehensive loss $ (25,971,000) $ (25,747,000) $ (22,289,000) $ (19,315,000)