Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jan. 02, 2021	Oct. 03, 2020	Dec. 28, 2019	Sep. 28, 2019	Jan. 02, 2021	Dec. 28, 2019
Numerator:
Net income	$ 19,163	$ (18,889)	$ 3,668	$ 41,752	$ 274	$ 45,420
Denominator:
Weighted average common shares for basic earnings per share	98,937		100,431		98,917	101,781
Net effect of dilutive stock based compensation awards	995		871		980	1,058
Weighted average common shares for diluted earnings per share	99,932		101,302		99,897	102,839
Basic earnings per share	$ 0.19		$ 0.04		$ 0.00	$ 0.45
Diluted earnings per share	$ 0.19		$ 0.04		$ 0.00	$ 0.44
Stock Options
Denominator:
antidilutive Securities	1,046		581		1,237	500