Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Millions						3 Months Ended			12 Months Ended
	Oct. 23, 2019 $ / shares	Oct. 22, 2019 $ / shares	Jan. 02, 2019 USD ($)	Mar. 28, 2018 $ / shares	Mar. 27, 2018 USD ($) $ / shares shares	Aug. 31, 2019 $ / shares shares	May 25, 2019 $ / shares shares	Feb. 23, 2019 $ / shares shares	Aug. 31, 2019 vote $ / shares shares
Class Of Stock [Line Items]
Shares repurchased (in shares) | shares						52,650	99,500	45,000	197,150
Repurchase of common stock, value | $			$ 100.0		$ 146.0
Total cost of shares repurchased divided by the total number of shares repurchased					$ 124.00	$ 181.61	$ 147.47	$ 139.57	$ 154.78
Class B Common Stock
Class Of Stock [Line Items]
Shares repurchased (in shares) | shares					1,105,000
Quarterly dividend amount (in dollars per share)				$ 0.09	$ 0.03
Voting rights | vote									10
Number of shares converted (in shares) | shares									67,000
Class B Common Stock | Subsequent Event
Class Of Stock [Line Items]
Quarterly dividend amount (in dollars per share)	$ 0.20	$ 0.09
Common Stock
Class Of Stock [Line Items]
Shares repurchased (in shares) | shares					73,000
Quarterly dividend amount (in dollars per share)				$ 0.1125	$ 0.0375
Voting rights | vote									1
Dividend rate									125.00%
Common Stock | Subsequent Event
Class Of Stock [Line Items]
Quarterly dividend amount (in dollars per share)	$ 0.25	$ 0.1125