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Debt (Shelf Facility Agreements) (Narrative) (Details) | 3 Months Ended
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Nov. 30, 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
Series 2018A Notes [Member] |
Line of Credit Facility [Line Items] |
Principal amount | $ 20,000,000
Interest rate | 3.22%
Maturity date | Jun. 11, 2020
Series 2018B Notes [Member] |
Line of Credit Facility [Line Items] |
Principal amount | $ 20,000,000
Interest rate | 3.42%
Maturity date | Jun. 11, 2021
Senior Notes Due January 2023 [Member] |
Line of Credit Facility [Line Items] |
Principal amount | $ 50,000,000
Interest rate | 3.04%
Maturity date | Jan. 12, 2023
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
Prudential Note Purchase Agreement [Member] |
Line of Credit Facility [Line Items] |
Credit facility, maximum borrowing capacity | 250,000,000
Remaining borrowing capacity | $ 200,000,000

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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