Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Restricted stock units	Performance share units	Common Stock	Common Stock Restricted stock units	Common Stock Performance share units	Additional paid in capital	Additional paid in capital Restricted stock units	Additional paid in capital Performance share units	Accumulated deficit	Accumulated other comprehensive income	Treasury Stock
Beginning Balance (in shares) at May. 31, 2021				38,920,951,000
Beginning Balance at May. 31, 2021	$ 439,457			$ 377			$ 573,507			$ (131,866)	$ 3,153	$ (5,714)
Beginning Balance, Treasury (in shares) at May. 31, 2021												(370,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(6,972)									(6,972)
Exercise of stock option (in shares)				80,635,000
Exercise of stock options	1,280			$ 1			1,279
Issuance/Cancellation of performance share units and restricted stock units, net (in shares)					279,495,000	59,371,000
Issuance/Cancellation of performance share units and restricted stock units		$ (1,734)						$ (1,734)
Purchase of common stock under ESPP (in shares)				49,789,000
Purchases of common stock under ESPP	900			$ 1			899
Stock-based compensation	2,429						2,429
Other comprehensive loss, net of tax	590										590
Ending Balance (in shares) at Aug. 31, 2021				39,390,241,000
Ending Balance at Aug. 31, 2021	435,950			$ 379			576,380			(138,838)	3,743	$ (5,714)
Ending Balance, Treasury (in shares) at Aug. 31, 2021												(370,000,000)
Beginning Balance (in shares) at May. 31, 2021				38,920,951,000
Beginning Balance at May. 31, 2021	439,457			$ 377			573,507			(131,866)	3,153	$ (5,714)
Beginning Balance, Treasury (in shares) at May. 31, 2021												(370,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(20,281)
Ending Balance (in shares) at Feb. 28, 2022				39,520,101,000
Ending Balance at Feb. 28, 2022	429,692			$ 380			583,647			(152,147)	3,526	$ (5,714)
Ending Balance, Treasury (in shares) at Feb. 28, 2022												(370,000,000)
Beginning Balance (in shares) at Aug. 31, 2021				39,390,241,000
Beginning Balance at Aug. 31, 2021	435,950			$ 379			576,380			(138,838)	3,743	$ (5,714)
Beginning Balance, Treasury (in shares) at Aug. 31, 2021												(370,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(8,351)									(8,351)
Exercise of stock option (in shares)				56,064,000
Exercise of stock options	1,022						1,022
Issuance/Cancellation of performance share units and restricted stock units, net (in shares)					8,695,000
Issuance/Cancellation of performance share units and restricted stock units		(83)						(83)
Purchase of common stock under ESPP (in shares)				193,000
Purchases of common stock under ESPP	3						3
Stock-based compensation	3,008						3,008
Other comprehensive loss, net of tax	819										819
Ending Balance (in shares) at Nov. 30, 2021				39,455,193,000
Ending Balance at Nov. 30, 2021	432,368			$ 379			580,330			(147,189)	4,562	$ (5,714)
Ending Balance, Treasury (in shares) at Nov. 30, 2021												(370,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(4,958)									(4,958)
Exercise of stock option (in shares)				5,000,000
Exercise of stock options	77						77
Issuance/Cancellation of performance share units and restricted stock units, net (in shares)					11,304,000
Issuance/Cancellation of performance share units and restricted stock units		(84)						(84)
Purchase of common stock under ESPP (in shares)				48,604,000
Purchases of common stock under ESPP	973			$ 1			972
Stock-based compensation	2,352						2,352
Other comprehensive loss, net of tax	(1,036)										(1,036)
Ending Balance (in shares) at Feb. 28, 2022				39,520,101,000
Ending Balance at Feb. 28, 2022	429,692			$ 380			583,647			(152,147)	3,526	$ (5,714)
Ending Balance, Treasury (in shares) at Feb. 28, 2022												(370,000,000)
Beginning Balance (in shares) at May. 31, 2022				39,541,173
Beginning Balance at May. 31, 2022	$ 424,489			$ 380			586,879			(158,413)	1,357	$ (5,714)
Beginning Balance, Treasury (in shares) at May. 31, 2022	(370,000)											(370,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (13,004)									(13,004)
Exercise of stock option (in shares)				6,617
Exercise of stock options	(29)						(29)
Issuance/Cancellation of performance share units and restricted stock units, net (in shares)					213,241	29,826
Issuance/Cancellation of performance share units and restricted stock units		(648)	$ (312)					(648)	$ (312)
Purchase of common stock under ESPP (in shares)				56,894
Purchases of common stock under ESPP	1,071			$ 1			1,070
Stock-based compensation	3,024						3,024
Other comprehensive loss, net of tax	(550)										(550)
Ending Balance (in shares) at Aug. 31, 2022				39,847,751
Ending Balance at Aug. 31, 2022	414,041			$ 381			589,984			(171,417)	807	$ (5,714)
Ending Balance, Treasury (in shares) at Aug. 31, 2022												370,000
Beginning Balance (in shares) at May. 31, 2022				39,541,173
Beginning Balance at May. 31, 2022	$ 424,489			$ 380			586,879			(158,413)	1,357	$ (5,714)
Beginning Balance, Treasury (in shares) at May. 31, 2022	(370,000)											(370,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (30,975)
Ending Balance (in shares) at Feb. 28, 2023				39,976,422
Ending Balance at Feb. 28, 2023	$ 397,655			$ 382			596,225			(189,388)	(3,850)	$ (5,714)
Ending Balance, Treasury (in shares) at Feb. 28, 2023	(370,000)											(370,000)
Beginning Balance (in shares) at Aug. 31, 2022				39,847,751
Beginning Balance at Aug. 31, 2022	$ 414,041			$ 381			589,984			(171,417)	807	$ (5,714)
Beginning Balance, Treasury (in shares) at Aug. 31, 2022												370,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(8,486)
Exercise of stock option (in shares)				15,000
Exercise of stock options	184						184
Issuance/Cancellation of performance share units and restricted stock units, net (in shares)					11,393
Issuance/Cancellation of performance share units and restricted stock units		(36)						(36)
Stock-based compensation	3,350						3,350
Other comprehensive loss, net of tax	(1,095)										(1,095)
Ending Balance (in shares) at Nov. 30, 2022				39,874,144
Ending Balance at Nov. 30, 2022	407,958			$ 381			593,482			(179,903)	(288)	$ (5,714)
Ending Balance, Treasury (in shares) at Nov. 30, 2022												(370,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(9,485)									(9,485)
Issuance/Cancellation of performance share units and restricted stock units, net (in shares)					9,394
Issuance/Cancellation of performance share units and restricted stock units		$ (36)						$ (36)
Purchase of common stock under ESPP (in shares)				92,884
Purchases of common stock under ESPP	977			$ 1			976
Stock-based compensation	1,803						1,803
Other comprehensive loss, net of tax	(3,562)										(3,562)
Ending Balance (in shares) at Feb. 28, 2023				39,976,422
Ending Balance at Feb. 28, 2023	$ 397,655			$ 382			$ 596,225			$ (189,388)	$ (3,850)	$ (5,714)
Ending Balance, Treasury (in shares) at Feb. 28, 2023	(370,000)											(370,000)