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Business and Basis of Presentation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
General and administrative (less than $1.0 million) $ (24,034) $ (21,999) $ (47,975) $ (42,409)
Other expense (income), net $ 335 $ (432) 422 $ (506)
Accounting Standards Update 2017-07        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
General and administrative (less than $1.0 million)     1,000  
Other expense (income), net     $ 1,000