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Debt (Shelf Facility Agreements) (Narrative) (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Aug. 28, 2021
USD ($)
Aug. 29, 2020
USD ($)
Aug. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
Line of Credit Facility [Line Items]          
Repayment of debt   $ 20,000 $ 20,000  
Shelf Facility Agreements [Member]          
Line of Credit Facility [Line Items]          
Credit facility, maximum borrowing capacity         $ 250,000
Private Placement Debt and Shelf Facility Agreements [Member]          
Line of Credit Facility [Line Items]          
Maximum consolidated leverage ratio of total indebtedness to EBITDA   3.00      
Maximum consolidated leverage ratio of total indebtedness to EBITDA after material acquisition   3.50      
Minimum consolidated interest coverage ratio of EBITDA to total interest expense   3.00      
Series Notes Due January 12, 2023 [Member] | Shelf Facility Agreements [Member]          
Line of Credit Facility [Line Items]          
Outstanding balance   $ 50,000      
Interest rate   3.04%      
Maturity date   Jan. 12, 2023      
Series Notes Due March 5, 2024 [Member] | Shelf Facility Agreements [Member]          
Line of Credit Facility [Line Items]          
Outstanding balance   $ 50,000      
Interest rate   2.40%      
Maturity date   Mar. 05, 2024      
Series 2018B notes, due June 11, 2021 [Member] | Met Life Note Purchase Agreement [Member]          
Line of Credit Facility [Line Items]          
Repayment of debt $ 20,000        
Interest rate 3.42%        
Series 2018B notes, due June 11, 2021 [Member] | Private Placement Debt [Member]          
Line of Credit Facility [Line Items]          
Interest rate   3.42%      
Maturity date   Jun. 11, 2021