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Stock-based Compensation and Stockholders’ Equity (Tables)

12 Months Ended

May 30, 2021

Share-based Payment Arrangement [Abstract]

Stock Option Weighted Average Assumptions

As of May 30, 2021, May 31, 2020 and May 26, 2019, the fair value of stock option grants was estimated using the following weighted average assumptions:

			Year Ended
			May 30, 2021						May 31, 2020						May 26, 2019
Weighted-average grant date fair value			$2.37						$2.55						$2.80
Assumptions:
Expected life (in years)			3.36						3.50						3.50
Risk-free interest rate			0.23		%				1.01		%				2.47		%
Volatility			33		%				31		%				27		%
Dividend yield			—		%				—		%				—		%

Schedule of Share-based Compensation Activity

A summary of the activity under the Company’s stock option plans as of May 30, 2021 and changes during the fiscal year then ended is presented below:

			Options Outstanding						Weighted-Average Exercise Price Per Share						Total Intrinsic Value of Options Exercised						Weighted-Average Remaining Contractual Term in Years						Aggregate Intrinsic Value
Options outstanding at May 27, 2018			1,955,335						$	13.20
Options granted			368,264						$	11.85
Options exercised			(116,834)						$	11.82					$	265,911
Options forfeited			(71,669)						$	13.75
Options expired			(135,000)						$	14.18
Options outstanding at May 26, 2019			2,000,096						$	12.94
Options granted			435,000						$	10.42
Options exercised			(163,333)						$	11.16					$	169,066
Options forfeited			(55,806)						$	13.08
Options expired			(499,599)						$	14.04
Options outstanding at May 31, 2020			1,716,358						$	12.15
Options granted			682,600						$	9.66
Options exercised			—						$	—
Options forfeited			(127,714)						$	9.93
Options expired			(437,227)						$	13.42
Options outstanding at May 30, 2021			1,834,017						$	11.07											4.18						$	2,446,243
Options exercisable at May 30, 2021			1,011,265						$	12.02											2.67						$	747,977

A summary of the Company’s restricted stock unit award activity as of May 30, 2021 and changes during the fiscal year then ended is presented below:

			Restricted Stock Units Outstanding						Weighted-Average Grant Date Fair Value Per Share
Restricted stock units/awards outstanding at May 27, 2018			408,037						$	12.99
Granted			333,486						$	13.15
Vested			(237,946)						$	13.27
Forfeited			(75,150)						$	13.92
Restricted stock units/awards outstanding at May 26, 2019			428,427						$	12.80
Granted			296,527						$	9.79
Vested			(124,045)						$	11.82
Forfeited			(131,361)						$	12.49
Restricted stock units/awards outstanding at May 31, 2020			469,548						$	11.24
Granted			188,225						$	10.13
Vested			(146,197)						$	11.69
Forfeited			(31,180)						$	10.60
Restricted stock units/awards outstanding at May 30, 2021			480,396						$	10.71

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table summarizes the stock-based compensation by statement of operations line item:

			Year Ended
(in thousands)			May 30, 2021						May 31, 2020						May 26, 2019
Cost of sales			$	403					$	162					$	449
Research and development			223						158						114
Selling, general and administrative			2,734						2,099						2,997
Total stock-based compensation			$	3,360					$	2,419					$	3,560

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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