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Stock-based compensation - Schedule of Weighted Average Assumptions (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Feb. 23, 2025	Feb. 25, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options exercised	$ 0	$ 115
Fair value of RSUs and PSUs vested (in dollars per share)	$ 5.88	$ 7.74
Tax benefit of options exercised	$ 0	$ 35
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value (in dollars per share)	$ 3.18	$ 3.91
Expected life	4 years 4 months 24 days	4 years 4 months 24 days
Risk-free interest rate	4.00%	4.30%
Volatility	53.00%	58.00%
Dividend yield	0.00%	0.00%
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value (in dollars per share)	$ 4.39	$ 8.25

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- Definition

Amount of tax benefit from exercise of option under share-based payment arrangement.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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