Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Mar. 28, 2025	Mar. 29, 2024	Mar. 31, 2023
Net sales	$ 725,006	$ 1,049,367	$ 973,653
Cost of goods sold	403,479	471,894	348,390
Cost of goods sold to related party	0	2,944	79,184
Gross profit	321,527	574,529	546,079
Operating expenses:
Research and development	179,649	176,638	150,850
Selling, general and administrative	161,680	188,429	191,922
Impairment of long-lived assets	0	13,218	0
Total operating expenses	341,329	378,285	342,772
Operating (loss) income	(19,802)	196,244	203,307
Other (expense) income:
Interest expense	(30,366)	(10,763)	(2,336)
Interest income	1,524	3,144	1,724
Foreign currency transaction (loss) gain	(2,172)	5,064	980
Income (loss) in earnings of equity investment	1,176	(538)	(406)
Loss on change in fair value of forward repurchase contract	(34,752)	0	0
Other (expense) income, net	(1,304)	1,646	8,077
(Loss) income before income taxes	(85,696)	194,797	211,346
Income tax (benefit) provision	(12,933)	41,909	23,852
Net (loss) income	(72,763)	152,888	187,494
Net income attributable to non-controlling interests	247	191	137
Net (loss) income attributable to Allegro MicroSystems, Inc.	$ (73,010)	$ 152,697	$ 187,357
Net (loss) income per common share attributable to Allegro MicroSystems, Inc.:
Basic (in dollars per share)	$ (0.39)	$ 0.79	$ 0.98
Diluted (in dollars per share)	$ (0.39)	$ 0.78	$ 0.97
Weighted average shares outstanding:
Basic (in shares)	187,707,391	192,573,169	191,197,452
Diluted (in shares)	187,707,391	194,674,352	193,688,102
Non-Related Party Revenue
Net sales	$ 725,006	$ 1,043,206	$ 812,890
Related Party Revenue
Net sales	$ 0	$ 6,161	$ 160,763