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Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Other Liabilities Disclosure [Abstract]      
Deferred rent $ 78,658 $ 79,913  
Postretirement benefit obligations 124,925 131,526  
Other 27,069 29,382  
Total other long-term liabilities 230,652 240,821  
Business Acquisition [Line Items]      
Long-term disability obligation 11,600 22,800  
Fair Value, Measurements, Recurring      
Business Acquisition [Line Items]      
Contingent consideration liability 1,224 3,576  
Fair Value, Measurements, Recurring | Level 3      
Business Acquisition [Line Items]      
Contingent consideration liability 1,224 3,576  
Fair Value, Measurements, Recurring | Level 3 | Other Noncurrent Liabilities      
Business Acquisition [Line Items]      
Contingent consideration liability $ 1,200 $ 3,600 $ 3,600