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Debt And Capital Lease Obligations (Shelf Facility Agreements) (Narrative) (Details)
 12 Months Ended
Aug. 31, 2019
USD ($)
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
Remaining borrowing capacity $ 200,000,000
Met Life Note Purchase Agreement [Member]  
Line of Credit Facility [Line Items]  
Credit facility, maximum borrowing capacity 250,000,000
Remaining borrowing capacity 210,000,000
Met Life Note Purchase Agreement [Member] | Series 2018A Notes [Member]  
Line of Credit Facility [Line Items]  
Principal amount $ 20,000,000
Interest rate 3.22%
Maturity date Jun. 11, 2020
Met Life Note Purchase Agreement [Member] | Series 2018B Notes [Member]  
Line of Credit Facility [Line Items]  
Principal amount $ 20,000,000
Interest rate 3.42%
Maturity date Jun. 11, 2021
Prudential Note Purchase Agreement [Member]  
Line of Credit Facility [Line Items]  
Credit facility, maximum borrowing capacity $ 250,000,000
Senior Notes [Member] | Prudential Note Purchase Agreement [Member]  
Line of Credit Facility [Line Items]  
Principal amount $ 50,000,000
Interest rate 3.04%
Maturity date Jan. 12, 2023