Stock-based compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
Jun. 01, 2020	Jun. 27, 2020
Restricted Stock Awards
Stock-based compensation
Unrecognized compensation expense related to outstanding restricted stock awards		$ 4,240
Average remaining service period for recognition of unrecognized compensation cost		1 year 4 months 24 days
Nonvested restricted shares		1,864,446
Amended and Restated 2013 Incentive Award Plan
Stock-based compensation
Number of shares available for grant	1,358,709
Granted (in dollars per share)	$ 3.03
Amended and Restated 2013 Incentive Award Plan \| Time - based restricted shares
Stock-based compensation
Vesting period	3 years
Amended and Restated 2013 Incentive Award Plan \| Performance - based restricted shares
Stock-based compensation
Vesting period	3 years

Weighted-average period over which cost not yet recognized is expected to be recognized for 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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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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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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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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