Loss Per Share - Reconciliation of the Components of Basic and Diluted Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Reconciliation of the components of the basic and diluted per share
Net loss attributable to STRATTEC	$ (10,502)	$ 2,994	$ (1,341)	$ 1,244	$ (62)	$ 1,730	$ (22,164)	$ 3,467	$ (7,605)	$ (17,029)
Weighted average shares of common stock outstanding									3,737	3,676
Diluted weighted average shares of common stock Outstanding									3,737	3,676
Basic loss per share	$ (2.80)	$ 0.80	$ (0.36)	$ 0.34	$ (0.02)	$ 0.47	$ (6.03)	$ 0.95	$ (2.04)	$ (4.63)
Diluted loss per share	$ (2.80)	$ 0.79	$ (0.36)	$ 0.33	$ (0.02)	$ 0.46	$ (5.96)	$ 0.93	$ (2.04)	$ (4.63)