Net income per common share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Mar. 28, 2020	Mar. 30, 2019	Mar. 31, 2018
Numerator:
Net income (loss)	$ 14,487	$ 21,680	$ 19,428
Denominator:
Weighted-average common shares - basic (in shares)	48,819,783	48,139,929	48,061,527
Options and other dilutive securities	144,781	260,478	86,198
Weighted Average Number of Shares Outstanding, Diluted, Total	48,964,564	48,400,407	48,147,725
Net income per common share — basic and diluted	$ 0.30	$ 0.45	$ 0.40
Stock options outstanding
Antidilutive securities not included:
Antidilutive securities	2,389,820	2,436,321	3,006,604
Nonvested restricted stock awards
Antidilutive securities not included:
Antidilutive securities	148,066	102,725	41,907

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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