Computation of Earnings Per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Jun. 29, 2025		Mar. 30, 2025		Dec. 29, 2024		Sep. 29, 2024		Jun. 30, 2024		Mar. 31, 2024		Dec. 31, 2023		Oct. 01, 2023		Jun. 29, 2025	Jun. 30, 2024	Jul. 02, 2023
Earnings Per Share [Abstract]
Net loss	$ 15,470	[1]	$ (16,794)	[1]	$ (11,392)	[1]	$ (7,632)	[1]	$ (3,984)	[2]	$ (10,295)	[2]	$ (19,846)	[2]	$ (13,270)	[2]	$ (20,348)	$ (47,395)	$ (46,344)
Weighted average common shares outstanding (in shares)																	18,314,000	18,154,000	18,037,000
Basic	$ 0.84	[3]	$ (0.92)	[3]	$ (0.62)	[3]	$ (0.42)	[3]	$ (0.22)	[3]	$ (0.57)	[3]	$ (1.1)	[3]	$ (0.73)	[3]	$ (1.11)	$ (2.61)	$ (2.57)
Net potential common share equivalents																	0
Adjusted weighted average common shares outstanding (in shares)																	18,314,000	18,154,000	18,037,000
Diluted	$ 0.82	[3]	$ (0.92)	[3]	$ (0.62)	[3]	$ (0.42)	[3]	$ (0.22)	[3]	$ (0.57)	[3]	$ (1.1)	[3]	$ (0.73)	[3]	$ (1.11)	$ (2.61)	$ (2.57)
Excluded from the calculation of common share equivalents:
Anti-dilutive common share equivalents (in shares)																	858,000	491,000
Unvested stock options that vest upon achievement of certain market conditions (in shares)																		333,000	333,000

[1] Net (loss) income for our domestic operations for all fiscal quarters of fiscal 2025 includes the adverse pressures on gross profit (loss) which included transition costs. In the fourth quarter of fiscal 2025, UNIFI recorded a gain of $35,807 related the sale of a manufacturing facility.

[2] Net loss for our domestic operations for all fiscal quarters of fiscal 2024 includes the adverse pressures on gross (loss) profit. Net loss for fiscal 2024 includes both a loss on dissolution of a joint venture and severance costs.

[3] (Loss) income per share is computed independently for each of the periods presented. The sum of the loss per share amounts for the fiscal quarters may not equal the total for the fiscal year.