CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Jun. 28, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (17,613)	$ 60,889
Net income attributable to non-controlling interests	62	39
Net (loss) income attributable to Allegro MicroSystems, Inc.	(17,675)	60,850
Other comprehensive loss:
Foreign currency translation adjustment, net of tax	(3,188)	(458)
Comprehensive (loss) income	(20,863)	60,392
Other comprehensive gain attributable to non-controlling interests	83	44
Comprehensive (loss) income attributable to Allegro MicroSystems,Inc.	$ (20,780)	$ 60,436