CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (33,613)	$ 65,671	$ (51,226)	$ 126,560
Net income attributable to non-controlling interests	62	54	124	93
Net (loss) income attributable to Allegro MicroSystems, Inc.	(33,675)	65,617	(51,350)	126,467
Other comprehensive income (loss):
Foreign currency translation adjustment, net of tax	5,435	(4,348)	2,247	(4,806)
Comprehensive (loss) income	(28,240)	61,269	(49,103)	121,661
Other comprehensive (loss) gain attributable to non-controlling interests	(72)	37	11	81
Comprehensive (loss) income attributable to Allegro MicroSystems,Inc.	$ (28,312)	$ 61,306	$ (49,092)	$ 121,742