Income taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2023	Dec. 30, 2022	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Liability for uncertain tax positions including accrued interest and penalties	$ 2.5		$ 1.5
Corporate effective income tax rate	5.20%	1.70%
Deferred tax assets, valuation allowance		$ 1.6