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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Apr. 01, 2019
Mar. 31, 2019
Accounting Policies [Abstract]      
Right-of-use asset $ 240,122 $ 268,840 $ 0
Operating lease liabilities $ 319,287 330,600  
Deferred tax liability corresponding to operating lease right-of-use assets   69,000  
Deferred tax asset corresponding to operating lease liabilities   $ 93,000  
Operating lease, deferred rent and tenant allowances     $ 24,000