Business Combination (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Nov. 07, 2019	Oct. 09, 2019	Feb. 29, 2020	Feb. 23, 2019	Feb. 29, 2020	Feb. 23, 2019
Business Acquisition [Line Items]
Payments to acquire business, equity issuance		$ 350,000
Business transaction costs			$ 694	$ 290	$ 26,853	$ 1,329
Fair value measurement period adjustment					3,300
Acquisition of Quest
Business Acquisition [Line Items]
Total purchase price	$ 988,946
Payments to acquire business, cash on hand	195,300
Payments to acquire business, equity issuance		$ 350,000
Proceeds from long-term line of credit	443,600
Business transaction costs					$ 26,900
Transaction advisory fees	14,500
Banker commitment fees	3,200
Non-deferrable debt issuance costs	6,100
Legal, due diligence and accounting fees	3,100
Intangible assets, net	848,375
Deferred income taxes	14,158
Property and equipment, net	10,363
Centerview Partners | Acquisition of Quest
Business Acquisition [Line Items]
Transaction advisory fees	12,000
Brands and trademarks | Acquisition of Quest
Business Acquisition [Line Items]
Intangible assets, net	730,000
Customer relationships | Acquisition of Quest
Business Acquisition [Line Items]
Intangible assets, net	115,000
Tax deductible goodwill	79,700
Customer relationships | Software and website development costs
Business Acquisition [Line Items]
Intangible assets, net	3,400
Leasehold improvements | Acquisition of Quest
Business Acquisition [Line Items]
Property and equipment, net	6,900
Furniture and fixtures | Acquisition of Quest
Business Acquisition [Line Items]
Property and equipment, net	2,200
Equipment | Acquisition of Quest
Business Acquisition [Line Items]
Property and equipment, net	$ 1,300