Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Disaggregation of Revenue [Line Items]
Total sales	$ 792.0	$ 834.7
Independent sales network
Disaggregation of Revenue [Line Items]
Total sales	599.5	618.0
Direct sales network
Disaggregation of Revenue [Line Items]
Total sales	76.3	84.3
Retail sales
Disaggregation of Revenue [Line Items]
Total sales	55.0	53.4
Corporate accounts
Disaggregation of Revenue [Line Items]
Total sales	24.0	33.5
Other
Disaggregation of Revenue [Line Items]
Total sales	$ 37.2	$ 45.5