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Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ 193,235 $ 179,301
Finite-Lived Intangible Assets, Net Carrying Value 81,680  
Impairment of Intangible Assets, Finite-lived 3,800  
Customer relationships and other amortizable intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 274,915 209,759
Accumulated Amortization 193,235 179,301
Finite-Lived Intangible Assets, Net Carrying Value $ 81,680 $ 30,458