Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2019	Nov. 30, 2018
Disaggregation of Revenue [Line Items]
Total sales	$ 834.7	$ 932.6
Independent sales network
Disaggregation of Revenue [Line Items]
Total sales	618.0	651.0
Direct sales network
Disaggregation of Revenue [Line Items]
Total sales	84.3	99.0
Retail sales
Disaggregation of Revenue [Line Items]
Total sales	53.4	85.2
Corporate accounts
Disaggregation of Revenue [Line Items]
Total sales	33.5	51.2
Other
Disaggregation of Revenue [Line Items]
Total sales	$ 45.5	$ 46.2