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Summary of Significant Accounting Policies Recently Issued Accounting Standards (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 31, 2020
Jan. 31, 2020
Aug. 01, 2019
Jul. 31, 2019
Jan. 31, 2019
Interest Rate Swap Notional Amount   $ 400,000      
Operating Lease, Right-of-Use Asset $ 227,394 227,394 $ 225,600 $ 0 $ 0
Operating Lease, Liability 264,124 264,124 258,000    
Operating Lease, Liability, Noncurrent 228,474 228,474 223,100 0 0
Operating Lease, Liability, Current 35,700 35,700 34,900    
Other Long Term Liabilities Noncurrent 245,375 245,375   $ 283,601 $ 274,998
Unfavorable Lease Obligation Net     $ 32,400    
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments 4,900 4,600      
Interest Rate Cash Flow Hedge Liability at Fair Value $ 4,563 $ 4,563