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Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Other Liabilities Disclosure [Abstract]    
Deferred rent $ 77,323 $ 79,913
Postretirement benefit obligations 135,191 131,526
Other 48,035 48,443
Total other long-term liabilities 260,549 259,882
Long-term disability obligation $ 22,800 22,800
Aquilent    
Business Acquisition [Line Items]    
Acquisition-related contingent consideration   $ 3,600