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Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Jan. 24, 2017
Other Liabilities Disclosure [Abstract]      
Deferred rent $ 65,990 $ 63,854  
Postretirement benefit obligations 124,986 123,492  
Other 41,600 40,593  
Total other long-term liabilities 232,576 $ 227,939  
Long-term disability obligation $ 22,500    
Aquilent      
Business Acquisition [Line Items]      
Acquisition-related contingent consideration     $ 3,576