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Debt And Capital Lease Obligations (Shelf Facility Agreements) (Narrative) (Details) | 12 Months Ended
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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

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