Selected Quarterly Financial Data (unaudited) - Summary of Selected Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 28, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jun. 28, 2020	Jun. 30, 2019
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 42,117	$ 116,938	$ 106,283	$ 119,962	$ 128,704	$ 128,230	$ 112,913	$ 117,159	$ 385,300	$ 487,006
Gross Profit	(7,783)	17,010	10,333	15,886	14,199	15,682	12,736	15,183	35,446	57,800
Net Income (Loss) Attributable to STRATTEC	$ (10,502)	$ 2,994	$ (1,341)	$ 1,244	$ (62)	$ 1,730	$ (22,164)	$ 3,467	$ (7,605)	$ (17,029)
Basic	$ (2.80)	$ 0.80	$ (0.36)	$ 0.34	$ (0.02)	$ 0.47	$ (6.03)	$ 0.95	$ (2.04)	$ (4.63)
Diluted	$ (2.80)	$ 0.79	$ (0.36)	$ 0.33	$ (0.02)	$ 0.46	$ (5.96)	$ 0.93	$ (2.04)	$ (4.63)