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Restructuring (Details) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2018
Restructuring related charges:        
Restructuring costs incurred       $ 25,400
Restructuring reserve        
Charges, net $ (116) $ 23 $ 17,802  
Termination Benefits        
Restructuring related charges:        
Restructuring costs incurred       24,300
Continuing Operations        
Restructuring reserve        
Balance at the beginning of the period 735 6,032 954 6,032
Charges, net (116) 23 17,802  
Cash payments (619) (5,320) (12,724)  
Balance at the end of the period 0 735 6,032 0
Continuing Operations | Termination Benefits        
Restructuring reserve        
Balance at the beginning of the period 735 5,907 0 5,907
Charges, net (116) 23 17,280  
Cash payments (619) (5,195) (11,373)  
Balance at the end of the period 0 735 5,907 0
Continuing Operations | Lease Exit Costs        
Restructuring reserve        
Balance at the beginning of the period 0 125 954 125
Charges, net 0 0 337  
Cash payments 0 (125) (1,166)  
Balance at the end of the period 0 0 125 0
Continuing Operations | Other        
Restructuring reserve        
Balance at the beginning of the period 0 0 0 0
Charges, net 0 0 185  
Cash payments 0 0 (185)  
Balance at the end of the period $ 0 $ 0 $ 0 $ 0