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Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				12 Months Ended
	May 31, 2020	Feb. 23, 2020	Nov. 24, 2019	Aug. 25, 2019	May 30, 2021	May 31, 2020	May 26, 2019
Numerator:
Net (loss) income	$ (15,149)	$ (11,518)	$ (6,740)	$ (4,784)	$ (32,665)	$ (38,191)	$ 411
Denominator:
Weighted average shares for basic net income per share (in shares)					29,294	29,162	28,359
Effect of dilutive securities:
Stock options and restricted stock units (in shares)					0	0	248
Weighted average shares for diluted net income (loss) per share (in shares)					29,294	29,162	28,607
Diluted net (loss) income per share (in dollars per share)					$ (1.12)	$ (1.31)	$ 0.01

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