Shareholders' equity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 29, 2023	Dec. 30, 2022	Dec. 29, 2023	Dec. 30, 2022	Aug. 31, 2023	Jun. 30, 2023	Aug. 31, 2022	Aug. 31, 2020	May 31, 2019	Feb. 28, 2018	Aug. 31, 2017
Shareholders Equity [Line Items]
Ordinary shares, authorized share capital (in shares)	500,000,000		500,000,000			500,000,000
Ordinary shares, par value (in USD per share)	$ 0.01		$ 0.01			$ 0.01
Preferred shares, shares authorized (in shares)	5,000,000		5,000,000			5,000,000
Preferred shares, par value (in USD per share)	$ 0.01		$ 0.01			$ 0.01
Share repurchase program, approved amount											$ 30,000,000
Share repurchase program, increase in shares authorized for repurchase					$ 47,600,000		$ 78,700,000	$ 58,500,000	$ 50,000,000	$ 30,000,000
Treasury stock, carrying basis	$ 93,600,000		$ 93,600,000		$ 294,800,000
Treasury stock acquired (in shares)		1,648	38,239	48,625
Treasury stock acquired, average cost (in USD per share)			$ 166.61
Repurchase of shares held as treasury shares	$ 6,372,000	$ 204,000	$ 6,372,000	$ 5,104,000
1999 and 2010 Stock Plan
Shareholders Equity [Line Items]
Ordinary shares issued upon vesting of restricted shares (in shares)	4,384	6,034	151,178	202,881