CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 24, 2021	Dec. 25, 2020	Dec. 24, 2021	Dec. 25, 2020
Net sales	$ 186,629	$ 164,449	$ 568,381	$ 416,099
Cost of goods sold	85,464	90,024	270,524	224,203
Gross profit	101,165	74,425	297,857	191,896
Operating expenses:
Research and development	30,297	30,999	89,441	80,509
Selling, general and administrative	37,963	67,650	104,115	118,677
Change in fair value of contingent consideration	(2,700)	0	(2,100)	0
Total operating expenses	65,560	98,649	191,456	199,186
Operating income (loss)	35,605	(24,224)	106,401	(7,290)
Other income (expense):
Loss on debt extinguishment	0	(9,055)	0	(9,055)
Interest expense, net	(269)	(2,598)	(1,764)	(1,935)
Foreign currency transaction loss	(3)	(145)	(55)	(1,331)
Income in earnings of equity investment	287	949	792	1,407
Other, net	3,634	(510)	5,216	(297)
Income (loss) before income tax provision (benefit)	39,254	(35,583)	110,590	(18,501)
Income tax provision (benefit)	6,281	(30,523)	16,687	(27,913)
Net income (loss)	32,973	(5,060)	93,903	9,412
Net income attributable to non-controlling interests	37	35	112	103
Net income (loss) attributable to Allegro MicroSystems, Inc.	$ 32,936	$ (5,095)	$ 93,791	$ 9,309
Net income (loss) attributable to Allegro MicroSystems, Inc. per share (Note 17):
Basic (in dollars per share)	$ 0.17	$ (0.04)	$ 0.49	$ 0.19
Diluted (in dollars per share)	$ 0.17	$ (0.04)	$ 0.49	$ 0.05
Weighted average shares outstanding:
Basic (in shares)	189,736,901	124,363,078	189,665,324	48,121,026
Diluted (in shares)	192,068,222	124,363,078	191,678,951	171,638,787
Non-Related Party Revenue
Net sales	$ 147,168	$ 138,010	$ 456,302	$ 343,529
Related Party Revenue
Net sales	$ 39,461	$ 26,439	$ 112,079	$ 72,570