Shareholders' equity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 25, 2022	Mar. 26, 2021	Mar. 25, 2022	Mar. 26, 2021	Jun. 25, 2021	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						$ 58,500,000	$ 50,000,000	$ 30,000,000
Treasury stock, carrying basis	$ 52,500,000		$ 52,500,000		$ 168,500,000
Treasury stock acquired (in shares)	237,339	15,354	275,608	116,903
Treasury stock acquired, average cost (in USD per share)	$ 101.90		$ 103.84
Treasury stock, value, acquired	$ 24,191,000	$ 1,238,000	$ 28,624,000	$ 8,312,000
1999 and 2010 Stock Plan
Shareholders Equity [Line Items]
Ordinary shares issued upon vesting of restricted shares (in shares)	30,729	43,098	290,680	269,199