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Share-based compensation - Narrative (Detail) - USD ($)
3 Months Ended 6 Months Ended
Dec. 24, 2021
Dec. 24, 2021
Dec. 25, 2020
Dec. 12, 2019
Nov. 02, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation costs capitalized $ 0 $ 0      
Shares authorized for future issuance (in shares)       1,281,619  
Shares withheld to settle employee minimum statutory obligation for applicable income and other employment taxes (in shares)   201,658 148,958    
Tax withholdings related to net share settlement of restricted share units   $ 19,481,000 $ 10,361,000    
Equity Incentive 2020 plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of ordinary shares available for grant (in shares)       1,700,000  
Shares reserved for future issuance (in shares)       1,300,000  
Stock Plan 2010          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of ordinary shares available for grant (in shares) 0 0      
Equity Incentive 2017 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized for future issuance (in shares)         160,000
Share units outstanding (in shares) 111,347 111,347      
Restricted share units | Equity Incentive 2020 plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share units outstanding (in shares) 323,164 323,164      
Restricted share units | Stock Plan 2020          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share units outstanding (in shares) 2,242,349 2,242,349      
Restricted share units | Stock Plan 2010          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share units outstanding (in shares) 171,943 171,943      
Restricted share units | Equity Incentive 2017 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share units outstanding (in shares) 12,164 12,164      
Restricted share units | Equity Incentive Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized share-based compensation expense $ 16,700,000 $ 16,700,000      
Unrecognized compensation expense, weighted-average period for recognition   2 years 6 months      
Restricted share units | Vesting option one          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award granted vesting period, year   3 years      
Restricted share units | Vesting option two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award granted vesting period, year   4 years      
Restricted share units | Non-employee director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award granted vesting period, year   1 year      
Restricted share units | Non-employee director | Vest on the first of January          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage   100.00%      
Performance share units | Stock Plan 2020          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share units outstanding (in shares) 295,550 295,550      
Performance share units | Executive of the Company          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award granted vesting period, year   2 years      
Performance share units | Executive of the Company | Vest at the end of the performance period | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage   0.00%      
Performance share units | Executive of the Company | Vest at the end of the performance period | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage   100.00%      
Performance share units | Equity Incentive Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized share-based compensation expense $ 12,600,000 $ 12,600,000      
Unrecognized compensation expense, weighted-average period for recognition   1 year 3 months 18 days