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Benefit Plans and Stock-Based Compensation - Summary of Birks' Restricted Stock Units And Deferred Share Units (Detail) - shares	12 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 31, 2018
Deferred Stock Units Dsu [Member]
Schedule Restricted Stock Options And Deferred Stock Units Line Items [Line Items]
Beginning balance	257,005	130,410	55,944
Grants of new units	244,844	133,588	74,466
Forfeited	(36,715)	(6,993)
Ending balance	465,134	257,005	130,410
Restricted Stock Units (RSUs) [Member]
Schedule Restricted Stock Options And Deferred Stock Units Line Items [Line Items]
Beginning balance	102,000	112,000	121,500
Settled in cash	(102,000)	(5,500)	(9,500)
Forfeited		(4,500)
Ending balance	0	102,000	112,000

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Share based compensation arrangement by share based payment award other than options settled in cash-

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Publisher FASB
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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