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Share Based Compensation Arrangement By Share Based Payment Award Options Settled In Cash.

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It represents percentage of outstanding stock option fully vested

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Share based compensation by share based payment arrangement excercises during the period other than options.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Description of the plan, including the basis for determining contributions, the employee groups covered, and the nature and effect of significant matters affecting comparability of information for all periods presented. For leveraged ESOPs and pension reversion ESOPs, the description generally includes the basis for releasing shares and how dividends on allocated and unallocated shares are used.

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The cash inflow associated with the amount received from holders exercising their stock warrants.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 14
-Subparagraph (a)
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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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Per share or unit weighted-average intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Net number of share options (or share units) granted during the period.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in CCYY-MM-DD format.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Benefit Plans and Stock-Based Compensation - Additional Information (Detail)							9 Months Ended	12 Months Ended
	Sep. 17, 2020 shares	Oct. 07, 2019 shares	Jun. 20, 2019 shares	Sep. 14, 2018 shares	Nov. 15, 2016 shares	Nov. 01, 2005 USD ($)	Sep. 07, 2017 shares	Mar. 27, 2021 USD ($) $ / shares shares	Mar. 27, 2021 CAD ($) shares	Mar. 28, 2020 USD ($) shares	Mar. 30, 2019 USD ($) shares	Mar. 31, 2018 shares	Mar. 25, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding								395,147		704,818	741,060	813,666
Weighted average exercise, Warrants								3.46%
Warrants and rights outstanding expire date								Aug. 20, 2022
Additional compensation expense \| $						$ 0
Class of warrants or rights exercised during period shares								131,209	131,209
Proceeds from warrant exercises								$ 438,000	$ 556,000
Class A Common Stock Voting Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right oustanding warrants exercisable during period, shares								251,484	251,484	382,693	382,693
Common Stock Voting Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost for recognized expenses \| $								$ 0		$ 26,000	$ 10,000
Common Stock Voting Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance								1,796,088
Amended Birks Employee Stock Option Plan [Member] \| Common Stock Voting Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price \| $ / shares								$ 1.05
Options granted								0	0	2,818	3,060
Stock Compensation Plan [Member] \| Common Stock Voting Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock option description								Birks ESOP	Birks ESOP
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense \| $								$ 300,000		$ 0	$ 0
Units granted								375,000	375,000
Number of shares outstanding								375,000		0	102,000	112,000
Share based compensation arrangement by share based payment award equity instruments other than options vested in period								68,000	68,000
Share based compensation arrangement fair value of cash settled based on intrinsic value \| $								$ 300,000		$ 0
Share based compensation arrangement closing stock price \| $ / shares								$ 3.62
Share based compensation arrangement weighted average remaining contractual life								2 years 8 months 12 days	2 years 8 months 12 days
Deferred Stock Units Dsu [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense \| $								$ 3,000,000		$ 0	$ 100,000
Units granted								223,878	223,878	244,844	133,588
Number of shares outstanding								689,012		465,134	257,005	130,410
Share based compensation arrangement fair value of cash settled based on intrinsic value \| $								$ 3,100,000		$ 100,000
Share based compensation arrangement closing stock price \| $ / shares								$ 3.62
Omnibus LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional stock options, granted								0	0
Omnibus LTIP [Member] \| Common Stock Voting Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding								142,000
Exercise price \| $ / shares								$ 1.43
Expiration period								10 years	10 years
Weighted Average Grant Date Fair Value \| $ / shares								$ 1.34
Dividend yield								0.00%	0.00%
Expected volatility								114.63%	114.63%
Weighted average expected term								10 years	10 years
Total compensation cost for recognized expenses \| $								$ 0		$ 21,000	$ 68,000
Shares reserved for issuance								1,000,000
Omnibus LTIP [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted	375,000				121,500
Number of shares outstanding								375,000		0
Omnibus LTIP [Member] \| Deferred Stock Units Dsu [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted	223,878	157,890	86,954	133,588	55,944		74,466
Outstanding shares								689,012		465,134
Share based compensation by share based payment arrangement number of units excercised other than options								36,715	36,715
Mayors Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding								0			0		41
Compensation expense \| $								$ 0		$ 0	$ 0
Options settled in cash								41	41		41
Options settled in cash per share \| $ / shares								$ 0.78
Long Term Incentive Plan [Member] \| Common Stock Voting Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term incentive plan stock appreciation rights, weighted average exercise price \| $ / shares								$ 1.12
Options outstanding								253,147
Long Term Incentive Plan [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation recognized liability \| $								$ 300,000		$ 0
Long Term Incentive Plan [Member] \| Stock Appreciation Rights (SARs) [Member] \| Common Stock Voting Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable								80,000
Share based compensation options unrecognised \| $								$ 0
Percentage of Outstanding Stock Options Fully Vested								100.00%	100.00%
Share based compensation grants in period gross								0	0	0	0