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Restructuring Costs (Cumulative Restructuring Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Restructuring charges [Line Items]        
Employee termination benefits $ 3,974   $ 4,000  
Impairment of Long-Lived Assets Held-for-use 14,584   14,600  
Goodwill impairment 889   900  
Asset Impairment Charges 15,473      
Restructuring and impairment costs [1] $ 19,447 $ 0 $ 19,447 $ 0
[1] Restructuring and impairment costs are excluded from segment operating income, but are included in consolidated operating income in the consolidated statements of income and comprehensive income.