CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss
Convertible Preferred Stock, beginning balance (in shares) at May. 31, 2020	0
Convertible Preferred Stock, beginning balance at May. 31, 2020	$ 0
Convertible Preferred Stock, ending balance (in shares) at Aug. 30, 2020	0
Convertible Preferred Stock, ending balance at Aug. 30, 2020	$ 0
Beginning balance (in shares) at May. 31, 2020		29,224,000
Beginning balance at May. 31, 2020	229,835	$ 29	$ 162,578	$ 70,036	$ (2,808)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock plans, net of shares withheld (in shares)		18,000
Taxes paid by Company for employee stock plans	(82)		(82)
Stock-based compensation	892		892
Net loss	(12,410)			(12,410)
Other comprehensive income, net of tax	304				304
Ending balance (in shares) at Aug. 30, 2020		29,242,000
Ending balance at Aug. 30, 2020	$ 218,539	$ 29	163,388	57,626	(2,504)
Convertible Preferred Stock, beginning balance (in shares) at May. 31, 2020	0
Convertible Preferred Stock, beginning balance at May. 31, 2020	$ 0
Convertible Preferred Stock, ending balance (in shares) at Nov. 29, 2020	0
Convertible Preferred Stock, ending balance at Nov. 29, 2020	$ 0
Beginning balance (in shares) at May. 31, 2020		29,224,000
Beginning balance at May. 31, 2020	229,835	$ 29	162,578	70,036	(2,808)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(24,033)
Other comprehensive income, net of tax	705
Ending balance (in shares) at Nov. 29, 2020		29,323,000
Ending balance at Nov. 29, 2020	$ 207,997	$ 29	164,068	46,003	(2,103)
Convertible Preferred Stock, beginning balance (in shares) at May. 31, 2020	0
Convertible Preferred Stock, beginning balance at May. 31, 2020	$ 0
Convertible Preferred Stock, ending balance (in shares) at Feb. 28, 2021	0
Convertible Preferred Stock, ending balance at Feb. 28, 2021	$ 0
Beginning balance (in shares) at May. 31, 2020		29,224,000
Beginning balance at May. 31, 2020	229,835	$ 29	162,578	70,036	(2,808)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(31,011)
Other comprehensive income, net of tax	1,092
Ending balance (in shares) at Feb. 28, 2021		29,323,000
Ending balance at Feb. 28, 2021	$ 202,203	$ 29	164,865	39,025	(1,716)
Convertible Preferred Stock, beginning balance (in shares) at May. 31, 2020	0
Convertible Preferred Stock, beginning balance at May. 31, 2020	$ 0
Convertible Preferred Stock, ending balance (in shares) at May. 30, 2021	0
Convertible Preferred Stock, ending balance at May. 30, 2021	$ 0
Beginning balance (in shares) at May. 31, 2020		29,224,000
Beginning balance at May. 31, 2020	229,835	$ 29	162,578	70,036	(2,808)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock plans, net of shares withheld (in shares)		109,000
Convertible Preferred Stock Paid in Kind (PIK) dividend	0
Taxes paid by Company for employee stock plans	(405)		(405)
Stock-based compensation	3,360		3,360
Net loss	(32,294)			(32,294)
Other comprehensive income, net of tax	1,450				1,450
Ending balance (in shares) at May. 30, 2021		29,333,000
Ending balance at May. 30, 2021	$ 201,946	$ 29	165,533	37,742	(1,358)
Convertible Preferred Stock, beginning balance (in shares) at Aug. 30, 2020	0
Convertible Preferred Stock, beginning balance at Aug. 30, 2020	$ 0
Convertible Preferred Stock, ending balance (in shares) at Nov. 29, 2020	0
Convertible Preferred Stock, ending balance at Nov. 29, 2020	$ 0
Beginning balance (in shares) at Aug. 30, 2020		29,242,000
Beginning balance at Aug. 30, 2020	218,539	$ 29	163,388	57,626	(2,504)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock plans, net of shares withheld (in shares)		81,000
Taxes paid by Company for employee stock plans	(215)		(215)
Stock-based compensation	895		895
Net loss	(11,623)			(11,623)
Other comprehensive income, net of tax	401				401
Ending balance (in shares) at Nov. 29, 2020		29,323,000
Ending balance at Nov. 29, 2020	$ 207,997	$ 29	164,068	46,003	(2,103)
Convertible Preferred Stock, ending balance (in shares) at Feb. 28, 2021	0
Convertible Preferred Stock, ending balance at Feb. 28, 2021	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	797		797
Net loss	(6,978)			(6,978)
Other comprehensive income, net of tax	387				387
Ending balance (in shares) at Feb. 28, 2021		29,323,000
Ending balance at Feb. 28, 2021	$ 202,203	$ 29	164,865	39,025	(1,716)
Convertible Preferred Stock, beginning balance (in shares) at May. 30, 2021	0
Convertible Preferred Stock, beginning balance at May. 30, 2021	$ 0
Convertible Preferred Stock, ending balance (in shares) at Aug. 29, 2021	0
Convertible Preferred Stock, ending balance at Aug. 29, 2021	$ 0
Beginning balance (in shares) at May. 30, 2021		29,333,000
Beginning balance at May. 30, 2021	201,946	$ 29	165,533	37,742	(1,358)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock plans, net of shares withheld (in shares)		129,000
Taxes paid by Company for employee stock plans	(428)		(428)
Stock-based compensation	620		620
Net loss	(9,387)			(9,387)
Other comprehensive income, net of tax	366				366
Ending balance (in shares) at Aug. 29, 2021		29,462,000
Ending balance at Aug. 29, 2021	$ 193,117	$ 29	165,725	28,355	(992)
Convertible Preferred Stock, beginning balance (in shares) at May. 30, 2021	0
Convertible Preferred Stock, beginning balance at May. 30, 2021	$ 0
Convertible Preferred Stock, ending balance (in shares) at Nov. 28, 2021	0
Convertible Preferred Stock, ending balance at Nov. 28, 2021	$ 0
Beginning balance (in shares) at May. 30, 2021		29,333,000
Beginning balance at May. 30, 2021	201,946	$ 29	165,533	37,742	(1,358)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(47,858)
Other comprehensive income, net of tax	542
Ending balance (in shares) at Nov. 28, 2021		29,481,000
Ending balance at Nov. 28, 2021	$ 155,424	$ 29	166,327	(10,116)	(816)
Convertible Preferred Stock, beginning balance (in shares) at May. 30, 2021	0
Convertible Preferred Stock, beginning balance at May. 30, 2021	$ 0
Convertible Preferred Stock, ending balance (in shares) at Feb. 27, 2022	0
Convertible Preferred Stock, ending balance at Feb. 27, 2022	$ 0
Beginning balance (in shares) at May. 30, 2021		29,333,000
Beginning balance at May. 30, 2021	201,946	$ 29	165,533	37,742	(1,358)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(61,444)
Other comprehensive income, net of tax	646
Ending balance (in shares) at Feb. 27, 2022		29,482,000
Ending balance at Feb. 27, 2022	$ 142,558	$ 29	166,943	(23,702)	(712)
Convertible Preferred Stock, beginning balance (in shares) at May. 30, 2021	0
Convertible Preferred Stock, beginning balance at May. 30, 2021	$ 0
Convertible Preferred Stock, ending balance (in shares) at May. 29, 2022	0
Convertible Preferred Stock, ending balance at May. 29, 2022	$ 0
Beginning balance (in shares) at May. 30, 2021		29,333,000
Beginning balance at May. 30, 2021	201,946	$ 29	165,533	37,742	(1,358)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock plans, net of shares withheld (in shares)		180,000
Issuance of stock under stock plans, net of shares withheld	1	$ 1
Convertible Preferred Stock Paid in Kind (PIK) dividend	0
Taxes paid by Company for employee stock plans	(789)		(789)
Stock-based compensation	2,608		2,608
Net loss	(116,715)			(116,715)
Other comprehensive income, net of tax	$ 772				772
Ending balance (in shares) at May. 29, 2022	29,513,000	29,513,000
Ending balance at May. 29, 2022	$ 87,823	$ 30	167,352	(78,973)	(586)
Convertible Preferred Stock, beginning balance (in shares) at Aug. 29, 2021	0
Convertible Preferred Stock, beginning balance at Aug. 29, 2021	$ 0
Convertible Preferred Stock, ending balance (in shares) at Nov. 28, 2021	0
Convertible Preferred Stock, ending balance at Nov. 28, 2021	$ 0
Beginning balance (in shares) at Aug. 29, 2021		29,462,000
Beginning balance at Aug. 29, 2021	193,117	$ 29	165,725	28,355	(992)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock plans, net of shares withheld (in shares)		19,000
Taxes paid by Company for employee stock plans	(84)		(84)
Stock-based compensation	686		686
Net loss	(38,471)			(38,471)
Other comprehensive income, net of tax	176				176
Ending balance (in shares) at Nov. 28, 2021		29,481,000
Ending balance at Nov. 28, 2021	$ 155,424	$ 29	166,327	(10,116)	(816)
Convertible Preferred Stock, ending balance (in shares) at Feb. 27, 2022	0
Convertible Preferred Stock, ending balance at Feb. 27, 2022	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock plans, net of shares withheld (in shares)		1,000
Taxes paid by Company for employee stock plans	(6)		(6)
Stock-based compensation	622		622
Net loss	(13,586)			(13,586)
Other comprehensive income, net of tax	104				104
Ending balance (in shares) at Feb. 27, 2022		29,482,000
Ending balance at Feb. 27, 2022	$ 142,558	$ 29	166,943	(23,702)	(712)
Convertible Preferred Stock, beginning balance (in shares) at May. 29, 2022	0
Convertible Preferred Stock, beginning balance at May. 29, 2022	$ 0
Convertible Preferred Stock, ending balance (in shares) at Aug. 28, 2022	0
Convertible Preferred Stock, ending balance at Aug. 28, 2022	$ 0
Beginning balance (in shares) at May. 29, 2022	29,513,000	29,513,000
Beginning balance at May. 29, 2022	$ 87,823	$ 30	167,352	(78,973)	(586)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock plans, net of shares withheld (in shares)		80,000
Taxes paid by Company for employee stock plans	(67)		(67)
Stock-based compensation	785		785
Net loss	(10,966)			(10,966)
Other comprehensive income, net of tax	300				300
Ending balance (in shares) at Aug. 28, 2022		29,593,000
Ending balance at Aug. 28, 2022	$ 77,875	$ 30	168,070	(89,939)	(286)
Convertible Preferred Stock, beginning balance (in shares) at May. 29, 2022	0
Convertible Preferred Stock, beginning balance at May. 29, 2022	$ 0
Convertible Preferred Stock, ending balance (in shares) at Nov. 27, 2022	0
Convertible Preferred Stock, ending balance at Nov. 27, 2022	$ 0
Beginning balance (in shares) at May. 29, 2022	29,513,000	29,513,000
Beginning balance at May. 29, 2022	$ 87,823	$ 30	167,352	(78,973)	(586)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(23,772)
Other comprehensive income, net of tax	586
Ending balance (in shares) at Nov. 27, 2022		30,297,000
Ending balance at Nov. 27, 2022	$ 71,143	$ 30	173,858	(102,745)	0
Convertible Preferred Stock, beginning balance (in shares) at May. 29, 2022	0
Convertible Preferred Stock, beginning balance at May. 29, 2022	$ 0
Convertible Preferred Stock, ending balance (in shares) at Feb. 26, 2023	39,000
Convertible Preferred Stock, ending balance at Feb. 26, 2023	$ 38,535
Beginning balance (in shares) at May. 29, 2022	29,513,000	29,513,000
Beginning balance at May. 29, 2022	$ 87,823	$ 30	167,352	(78,973)	(586)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Convertible Preferred Stock Paid in Kind (PIK) dividend	(428)
Net loss	(60,279)
Other comprehensive income, net of tax	586
Ending balance (in shares) at Feb. 26, 2023		30,319,000
Ending balance at Feb. 26, 2023	$ 35,021	$ 30	174,243	(139,252)	0
Convertible Preferred Stock, beginning balance (in shares) at May. 29, 2022	0
Convertible Preferred Stock, beginning balance at May. 29, 2022	$ 0
Increase (Decrease) in Temporary Equity [Roll Forward]
Proceeds of Convertible Preferred Stock, net of issuance costs (in shares)	39,000
Proceeds of Convertible Preferred Stock, net of issuance costs	$ 38,082
Accretion of Convertible Preferred Stock	73
Convertible Preferred Stock Paid in Kind (PIK) dividend	$ 1,163
Convertible Preferred Stock, ending balance (in shares) at May. 28, 2023	39,000
Convertible Preferred Stock, ending balance at May. 28, 2023	$ 39,318
Beginning balance (in shares) at May. 29, 2022	29,513,000	29,513,000
Beginning balance at May. 29, 2022	$ 87,823	$ 30	167,352	(78,973)	(586)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock plans, net of shares withheld (in shares)		181,000
Accretion of Convertible Preferred Stock	(73)		(73)
Convertible Preferred Stock Paid in Kind (PIK) dividend	(1,163)		(1,163)
Taxes paid by Company for employee stock plans	(274)		(274)
Stock-based compensation	3,612		3,612
Net loss	(99,563)			(99,563)
Other comprehensive income, net of tax	586				586
Issuance of shares to Wynnefield Capital, Inc., net of issuance costs (in shares)		628,000
Issuance of shares to Wynnefield Capital, Inc., net of issuance costs	$ 4,822		4,822
Ending balance (in shares) at May. 28, 2023	30,322,000	30,322,000
Ending balance at May. 28, 2023	$ (4,230)	$ 30	174,276	(178,536)	0
Convertible Preferred Stock, beginning balance (in shares) at Aug. 28, 2022	0
Convertible Preferred Stock, beginning balance at Aug. 28, 2022	$ 0
Convertible Preferred Stock, ending balance (in shares) at Nov. 27, 2022	0
Convertible Preferred Stock, ending balance at Nov. 27, 2022	$ 0
Beginning balance (in shares) at Aug. 28, 2022		29,593,000
Beginning balance at Aug. 28, 2022	77,875	$ 30	168,070	(89,939)	(286)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock plans, net of shares withheld (in shares)		76,000
Taxes paid by Company for employee stock plans	(142)		(142)
Stock-based compensation	1,108		1,108
Net loss	(12,806)			(12,806)
Other comprehensive income, net of tax	286				286
Issuance of shares to Wynnefield Capital, Inc., net of issuance costs (in shares)		628,000
Issuance of shares to Wynnefield Capital, Inc., net of issuance costs	4,822		4,822
Ending balance (in shares) at Nov. 27, 2022		30,297,000
Ending balance at Nov. 27, 2022	$ 71,143	$ 30	173,858	(102,745)	0
Increase (Decrease) in Temporary Equity [Roll Forward]
Proceeds of Convertible Preferred Stock, net of issuance costs (in shares)	39,000
Proceeds of Convertible Preferred Stock, net of issuance costs	$ 38,082
Accretion of Convertible Preferred Stock	25
Convertible Preferred Stock Paid in Kind (PIK) dividend	$ 428
Convertible Preferred Stock, ending balance (in shares) at Feb. 26, 2023	39,000
Convertible Preferred Stock, ending balance at Feb. 26, 2023	$ 38,535
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock plans, net of shares withheld (in shares)		22,000
Accretion of Convertible Preferred Stock	(25)		(25)
Convertible Preferred Stock Paid in Kind (PIK) dividend			(428)
Taxes paid by Company for employee stock plans	(65)		(65)
Stock-based compensation	903		903
Net loss	(36,507)			(36,507)
Ending balance (in shares) at Feb. 26, 2023		30,319,000
Ending balance at Feb. 26, 2023	$ 35,021	$ 30	174,243	(139,252)	0
Convertible Preferred Stock, ending balance (in shares) at May. 28, 2023	39,000
Convertible Preferred Stock, ending balance at May. 28, 2023	$ 39,318
Ending balance (in shares) at May. 28, 2023	30,322,000	30,322,000
Ending balance at May. 28, 2023	$ (4,230)	$ 30	$ 174,276	$ (178,536)	$ 0