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Long-Term Debt (Narrative) (Details)
$ in Millions
12 Months Ended
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]  
Debt Instrument, Term 5 years
Five-year term [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Term 5 years
Term loan $ 150
Debt Instrument, Interest Rate, Effective Percentage 2.94%
Seven-year term [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Term 7 years
Term loan $ 220
Debt Instrument, Interest Rate, Effective Percentage 3.48%