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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 29, 2020 | Feb. 23, 2019 | Feb. 29, 2020 | Feb. 23, 2019 | Aug. 31, 2019
Revenue From Contract With Customer [Abstract] |  |  |  |  |
Percentage of revenues derived from route servicing fees | 90.20% | 91.00% | 90.90% | 91.00% |
Current assets related to deferred commissions | $ 13.1 |  | $ 13.1 |  | $ 12.4
Noncurrent assets related to deferred commissions | 54.3 |  | 54.3 |  | $ 50.3
Amortization expense related to deferred commissions | $ 3.4 | $ 2.9 | $ 6.7 | $ 5.7 |

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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