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 |