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Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 25, 2020	Dec. 27, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (5,060)	$ 8,958	$ 9,412	$ 23,776
Foreign currency translation adjustment	3,972	2,886	10,152	1,869
Net actuarial loss amortization of net transition obligation and prior service costs related to defined benefit plans, net of tax	0	0	(313)	0
Comprehensive (loss) income	(1,088)	11,844	19,251	25,645
Comprehensive expense attributable to non-controlling interest	(10)	(23)	(34)	(5)
Comprehensive (loss) income attributable to Allegro MicroSystems, Inc.	$ (1,098)	$ 11,821	$ 19,217	$ 25,640

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