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Long-term Debt and Finance Lease Obligations, Lines of Credit and Fair Value Disclosure - Narrative (Details) - USD ($)
3 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Jun. 01, 2023
May 31, 2023
Apr. 30, 2023
Debt Instrument          
Fair value of long-term debt $ 1,396,000,000       $ 1,437,000,000
Finance lease obligations 100,908,000       95,072,000
Interest income 3,576,000 $ 0      
Capitalized interest 794,000 $ 581,000      
Unsecured Revolving Credit Facility Due January 2024 | Revolving Credit Facility          
Debt Instrument          
Maximum borrowing capacity 850,000,000        
Fair value of amount outstanding $ 0       0
Unsecured Revolving Credit Facility Due January 2024 | Revolving Credit Facility | Federal Funds          
Debt Instrument          
Effective percentage 0.50%        
Unsecured Revolving Credit Facility Due January 2024 | Revolving Credit Facility | Secured Overnight Financing Rate          
Debt Instrument          
Effective percentage 0.10%        
Unsecured Revolving Credit Facility Due January 2024 | Revolving Credit Facility | Daily Simple Secured Overnight Financing Rate          
Debt Instrument          
Effective percentage 1.00%        
Unsecured Revolving Credit Facility Due January 2024 | Minimum | Revolving Credit Facility          
Debt Instrument          
Facility fee percentage 0.15%        
Unsecured Revolving Credit Facility Due January 2024 | Minimum | Revolving Credit Facility | Secured Overnight Financing Rate          
Debt Instrument          
Effective percentage 0.00%        
Basis spread on variable rate 1.10%        
Unsecured Revolving Credit Facility Due January 2024 | Minimum | Revolving Credit Facility | Daily Simple Secured Overnight Financing Rate          
Debt Instrument          
Effective percentage 1.00%        
Basis spread on variable rate 0.10%        
Unsecured Revolving Credit Facility Due January 2024 | Maximum | Revolving Credit Facility          
Debt Instrument          
Facility fee percentage 0.30%        
Unsecured Revolving Credit Facility Due January 2024 | Maximum | Revolving Credit Facility | Secured Overnight Financing Rate          
Debt Instrument          
Basis spread on variable rate 1.70%        
Unsecured Revolving Credit Facility Due January 2024 | Maximum | Revolving Credit Facility | Daily Simple Secured Overnight Financing Rate          
Debt Instrument          
Basis spread on variable rate 0.70%        
Unsecured Revolving Line of Credit | Line of Credit          
Debt Instrument          
Maximum borrowing capacity     $ 50,000,000 $ 25,000,000  
Fair value of amount outstanding $ 0       $ 0
Unsecured Revolving Line of Credit | Letter of Credit          
Debt Instrument          
Maximum borrowing capacity $ 432,000