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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 |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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