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Debt (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 31, 2020
USD ($)
Apr. 30, 2021
USD ($)
Sep. 05, 2018
USD ($)
Revolving Credit Facility [Member]      
Line of Credit Facility [Abstract]      
Amount drawn from debt instrument $ 39,395    
Debt instrument, term of option 1 year    
2019 Revolving Credit Facility [Member]      
Line of Credit Facility [Abstract]      
Line of credit facility, term   5 years  
Maximum borrowing capacity     $ 950,000
Option to increase revolving credit facility     $ 300,000
Outstanding borrowings $ 949,395 $ 614,395  
Amount of standby letters of credit   31,626  
Remaining borrowing capacity   193,374  
Liquidity requirements   100,000  
Dividends threshold   $ 100,000  
Leverage ratio, maximum   3.00  
Multiplier used in calculating aggregate amount of cash dividends on shares of common stock in any fiscal year   4  
2019 Revolving Credit Facility [Member] | Covid-19 [Member]      
Line of Credit Facility [Abstract]      
Maximum borrowing capacity   $ 800,000  
Liquidity amount   140,000  
Maximum cash payments for capital expenditures   70,000  
Cash payments made for capital expenditures during covenant relief period   12,704  
2019 Revolving Credit Facility, Swapped Portion [Member]      
Line of Credit Facility [Abstract]      
Outstanding borrowings   $ 400,000  
Weighted average interest rates   5.86%  
2019 Revolving Credit Facility, Remaining Portion [Member]      
Line of Credit Facility [Abstract]      
Outstanding borrowings   $ 214,395  
Weighted average interest rates   3.69%