CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Treasury Shares	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at beginning of period at Mar. 31, 2020	$ 276,741	$ 159	$ (75,377)	$ 48,327	$ 315,078	$ (11,446)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,328			1,328
Stock activity under stock plans	(1,670)	1	(1,670)	(1)
Repurchase of common shares	(7,291)		(7,291)
Reissuance of treasury shares	3,647		3,131	516
Net income	11,960				11,960
Dividends	(1,984)			12	(1,996)
Other comprehensive income (loss), net of tax	1,279					1,279
Balance at end of period at Jun. 30, 2020	284,010	160	(81,207)	50,182	325,042	(10,167)
Balance at beginning of period at Mar. 31, 2020	276,741	159	(75,377)	48,327	315,078	(11,446)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attribute to Whitmore JV	30,660
Net income	30,660
Other comprehensive income (loss), net of tax	4,808
Balance at end of period at Dec. 31, 2020	402,717	161	(34,075)	103,538	339,731	(6,638)
Balance at beginning of period at Jun. 30, 2020	284,010	160	(81,207)	50,182	325,042	(10,167)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,222			1,222
Stock activity under stock plans	(6)		(6)
Reissuance of treasury shares	1,333		1,812	(479)	0
Net income	16,354				16,354
Dividends	(1,988)			11	(1,999)
Other comprehensive income (loss), net of tax	1,116					1,116
Balance at end of period at Sep. 30, 2020	302,041	160	(79,401)	50,936	339,397	(9,051)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,395			1,395
Stock activity under stock plans	(1,135)	1	(1,136)
Reissuance of treasury shares	97,656		46,462	51,194	0
Net income attribute to Whitmore JV	2,346
Net income	2,346				2,346
Dividends	(1,999)			13	(2,012)
Other comprehensive income (loss), net of tax	2,413					2,413
Balance at end of period at Dec. 31, 2020	402,717	161	(34,075)	103,538	339,731	(6,638)
Balance at beginning of period at Mar. 31, 2021	412,013	161	(34,075)	104,689	347,234	(5,996)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,888			1,888
Stock activity under stock plans	(3,169)		(3,168)	(1)
Reissuance of treasury shares	2,311		1,375	936
Net income attribute to Whitmore JV	20,048				20,048
Dividends	(2,358)			19	(2,377)
Other comprehensive income (loss), net of tax	387					387
Balance at end of period at Jun. 30, 2021	431,120	161	(35,868)	107,531	364,905	(5,609)
Balance at beginning of period at Mar. 31, 2021	412,013	161	(34,075)	104,689	347,234	(5,996)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attribute to Whitmore JV	46,354
Net income	47,339
Other comprehensive income (loss), net of tax	(62)
Balance at end of period at Dec. 31, 2021	458,738	162	(32,604)	110,790	386,448	(6,058)
Balance at beginning of period at Jun. 30, 2021	431,120	161	(35,868)	107,531	364,905	(5,609)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	2,049			2,049
Stock activity under stock plans	(13)		(13)
Reissuance of treasury shares	574		1,568	(994)
Net income attribute to Whitmore JV	17,996				17,996
Dividends	(2,360)			18	(2,378)
Other comprehensive income (loss), net of tax	(419)					(419)
Balance at end of period at Sep. 30, 2021	448,947	161	(34,313)	108,604	380,523	(6,028)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	2,287			2,287
Stock activity under stock plans	(1,697)	1	(1,698)
Repurchase of common shares	(477)		(477)
Reissuance of treasury shares	3,765		3,884	(119)
Net income attribute to Whitmore JV	8,311				8,311
Net income	8,769
Dividends	(2,368)			18	(2,386)
Other comprehensive income (loss), net of tax	(30)					(30)
Balance at end of period at Dec. 31, 2021	$ 458,738	$ 162	$ (32,604)	$ 110,790	$ 386,448	$ (6,058)