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Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Other Liabilities Disclosure [Abstract]    
Deferred rent $ 74,559 $ 79,913
Postretirement benefit obligations 136,711 131,526
Other 91,662 48,443
Total other long-term liabilities 302,932 259,882
Long-term disability obligation 11,600 22,800
Business Acquisition [Line Items]    
Long-term disability obligation (11,600) (22,800)
Increase (decrease) in postemployment benefits liability, noncurrent (11,200)  
Fair Value, Measurements, Recurring    
Business Acquisition [Line Items]    
Contingent consideration, liability 1,958 3,576
Fair Value, Measurements, Recurring | Level 3    
Business Acquisition [Line Items]    
Contingent consideration, liability 1,958 3,576
Fair Value, Measurements, Recurring | Other Noncurrent Liabilities | Level 3    
Business Acquisition [Line Items]    
Contingent consideration, liability $ 2,000 $ 3,600