CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Jun. 24, 2022	Jun. 25, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 10,283	$ 27,707
Net income attributable to non-controlling interests	36	38
Net income attributable to Allegro MicroSystems, Inc.	10,247	27,669
Other comprehensive loss:
Foreign currency translation adjustment	(6,818)	(30)
Comprehensive income	3,429	27,639
Other comprehensive loss attributable to non-controlling interest	68	30
Comprehensive income attributable to Allegro MicroSystems, Inc.	$ 3,497	$ 27,669