Correction of Error in Previously Reported Fiscal Year 2022 Interim Financial Statements (Unaudited) - Income Statement (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	May 29, 2022	Feb. 27, 2022	Nov. 28, 2021	Aug. 29, 2021	May 30, 2021	Feb. 28, 2021	Nov. 29, 2020	Aug. 30, 2020	Feb. 27, 2022	May 29, 2022	May 30, 2021	May 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Product sales	$ 47,628	$ 53,074	$ 43,452	$ 41,632	$ 44,916	$ 44,690	$ 39,945	$ 41,995	$ 138,158	$ 185,786	$ 171,546	$ 160,066
Cost of product sales		39,854							99,900	135,416	121,075	120,679
Gross profit	12,112	13,220	14,635	10,403	14,580	14,441	13,601	7,849	38,258	50,370	50,471	39,387
Operating costs and expenses:
Research and development		2,056							5,785	7,841	7,423	7,582
Selling, general and administrative		16,350							34,113	46,127	37,660	40,674
Restructuring costs		5,270							7,530	8,961	3,759	4,054
Total operating costs and expenses		23,676							47,428	109,018	50,605	65,263
Operating loss		(10,456)							(9,170)	(58,648)	(134)	(25,876)
Interest income		20							66	81	48	72
Interest expense, net		(4,105)							(13,877)	(17,357)	(10,387)	(4,646)
Transition services income		5,473							5,473	5,814	0	0
Other income (expense), net		454							642	641	111	(195)
Net loss from continuing operations before taxes		(8,614)							(16,866)	(69,469)	(11,472)	(30,645)
Income tax benefit		313							5,026	5,945	1,903	8,774
Net loss from continuing operations	(51,684)	(8,301)	3,675	(7,214)	(780)	(1,465)	(2,367)	(4,957)	(11,840)	(63,524)	(9,569)	(21,871)
Loss from discontinued operations, net of tax	$ (1,879)	$ (4,785)	$ (42,196)	$ (2,295)	$ (2,085)	$ (4,033)	$ (10,934)	$ (6,044)	$ (49,276)	(51,155)	(23,096)	(16,320)
Discontinued operations:
Loss from discontinued operations										(51,276)	(28,994)	(20,662)
Income tax benefit										$ 121	$ 5,898	$ 4,342
Basic net loss per share:
Loss from continuing operations (in dollars per share)	$ (1.75)	$ (0.28)	$ 0.12	$ (0.25)	$ (0.03)	$ (0.05)	$ (0.08)	$ (0.17)	$ (0.41)	$ (2.16)	$ (0.33)	$ (0.75)
Loss from discontinued operations (in dollars per share)	(0.06)	(0.16)	(1.44)	(0.08)	(0.07)	(0.14)	(0.37)	(0.21)	(1.68)	(1.74)	(0.79)	(0.56)
Total basic net loss per share (in dollars per share)		(0.44)							(2.09)	(3.90)	(1.12)	(1.31)
Diluted net loss per share:
Loss from continuing operations (in dollars per share)	(1.75)	(0.28)	0.12	(0.25)	(0.03)	(0.05)	(0.08)	(0.17)	(0.41)	(2.16)	(0.33)	(0.75)
Loss from discontinued operations (in dollars per share)	$ (0.06)	(0.16)	$ (1.44)	$ (0.08)	$ (0.07)	$ (0.14)	$ (0.37)	$ (0.21)	(1.68)	(1.74)	(0.79)	(0.56)
Total diluted net loss per share (in dollars per share)		$ (0.44)							$ (2.09)	$ (3.90)	$ (1.12)	$ (1.31)
Other comprehensive (loss) income, net of tax:
Net unrealized gains (losses) on interest rate swaps, (net of tax effect of , -$455, and $(455))		$ 104							$ 646	$ 772	$ 1,450	$ (2,872)
Other comprehensive (loss) income, net		104							646	772	1,450	(2,872)
Total comprehensive loss		(12,982)							(60,470)	(113,907)	$ (31,215)	$ (41,063)
As reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Product sales		53,074							138,158	185,786
Cost of product sales		39,179							99,113	135,416
Gross profit		13,895							39,045	50,370
Operating costs and expenses:
Research and development		2,056							5,785	7,841
Selling, general and administrative		9,725							27,207	46,127
Restructuring costs		5,865							8,406	8,961
Total operating costs and expenses		17,646							41,398	91,664
Operating loss		(3,751)							(2,353)	(41,294)
Interest income		20							66	81
Interest expense, net		(4,105)							(13,877)	(17,357)
Transition services income		0							0	5,814
Other income (expense), net		454							642	641
Net loss from continuing operations before taxes		(7,382)							(15,522)	(52,115)
Income tax benefit		276							5,012	5,839
Net loss from continuing operations	$ (34,436)	(7,106)							(10,510)	(46,276)
Loss from discontinued operations, net of tax		$ (5,744)							$ (50,258)	(51,155)
Discontinued operations:
Loss from discontinued operations										(51,276)
Income tax benefit										$ 121
Basic net loss per share:
Loss from continuing operations (in dollars per share)	$ (1.16)	$ (0.24)							$ (0.36)	$ (1.57)
Loss from discontinued operations (in dollars per share)		(0.19)							(1.71)	(1.74)
Total basic net loss per share (in dollars per share)		(0.43)							(2.07)	(3.31)
Diluted net loss per share:
Loss from continuing operations (in dollars per share)	$ (1.16)	(0.24)							(0.36)	(1.57)
Loss from discontinued operations (in dollars per share)		(0.19)							(1.71)	(1.74)
Total diluted net loss per share (in dollars per share)		$ (0.43)							$ (2.07)	$ (3.31)
Other comprehensive (loss) income, net of tax:
Net unrealized gains (losses) on interest rate swaps, (net of tax effect of , -$455, and $(455))		$ 104							$ 646
Other comprehensive (loss) income, net		104							646	$ 772
Total comprehensive loss		(12,746)							(60,122)	(96,659)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Product sales		0							0	0
Cost of product sales		675							787	0
Gross profit		(675)							(787)	0
Operating costs and expenses:
Research and development		0							0	0
Selling, general and administrative		6,625							6,906	0
Restructuring costs		(595)							(876)	0
Total operating costs and expenses		6,030							6,030	17,354
Operating loss		(6,705)							(6,817)	(17,354)
Interest income		0							0	0
Interest expense, net		0							0	0
Transition services income		5,473							5,473	0
Other income (expense), net		0							0	0
Net loss from continuing operations before taxes		(1,232)							(1,344)	(17,354)
Income tax benefit		37							14	106
Net loss from continuing operations		(1,195)							(1,330)	(17,248)
Loss from discontinued operations, net of tax		$ 959							$ 982	0
Discontinued operations:
Loss from discontinued operations										0
Income tax benefit										$ 0
Basic net loss per share:
Loss from continuing operations (in dollars per share)		$ (0.04)							$ (0.05)	$ (0.59)
Loss from discontinued operations (in dollars per share)		0.03							0.03	0
Total basic net loss per share (in dollars per share)		(0.01)							(0.02)	(0.59)
Diluted net loss per share:
Loss from continuing operations (in dollars per share)		(0.04)							(0.05)	(0.59)
Loss from discontinued operations (in dollars per share)		0.03							0.03	0
Total diluted net loss per share (in dollars per share)		$ (0.01)							$ (0.02)	$ (0.59)
Other comprehensive (loss) income, net of tax:
Net unrealized gains (losses) on interest rate swaps, (net of tax effect of , -$455, and $(455))		$ 0							$ 0
Other comprehensive (loss) income, net		0							0
Total comprehensive loss		$ (236)							$ (348)	$ (17,248)