Consolidated Statements of Equity - USD ($) $ in Thousands		Total		Cumulative Effect, Period of Adoption, Adjustment	As Computed Under LIFO	Effect of Change	Effect of Change Cumulative Effect, Period of Adoption, Adjustment	Common Stock		Common Stock As Computed Under LIFO	Treasury Shares		Treasury Shares As Computed Under LIFO	Additional Paid-In Capital		Additional Paid-In Capital As Computed Under LIFO	Retained Earnings		Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings As Computed Under LIFO	Retained Earnings Effect of Change Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss		Accumulated Other Comprehensive Loss As Computed Under LIFO
Balance at beginning of period at Mar. 31, 2019		$ 267,471	[1]	$ (206)	$ 263,686		$ 3,785	$ 158	[1]	$ 158	$ (49,964)	[1]	$ (49,964)	$ 46,633	[1]	$ 46,633	$ 281,373	[1]	$ (206)	$ 277,588	$ 3,785	$ (10,729)	[1]	$ (10,729)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation		5,074												5,074
Stock activity under stock plans		(1,980)						1			1,451			(3,432)
Repurchase of common shares		(26,864)									(26,864)
Net income		45,717	[2]		45,877	$ (160)											45,717
Dividends		(8,130)												52			(8,182)
Other comprehensive loss, net of tax		(717)	[3]																			(717)
Balance at end of period at Mar. 31, 2020	[1]	280,365						159			(75,377)			48,327			318,702					(11,446)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation		5,085												5,085
Stock activity under stock plans		(2,812)						2			(2,812)			(2)
Reissuance of treasury shares		102,638									51,405			51,233
Repurchase of common shares		(7,291)									(7,291)
Net income		40,099	[2]		40,287	(188)											40,099
Dividends		(8,085)												47			(8,132)
Other comprehensive loss, net of tax		5,450	[3]																			5,450
Balance at end of period at Mar. 31, 2021	[1]	415,450	[4]					161			(34,075)			104,690			350,670					(5,996)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation		8,450												8,450
Stock activity under stock plans		(4,883)						1			(4,884)			0
Reissuance of treasury shares		6,649									6,938			(289)
Repurchase of common shares		(14,427)									(14,427)
Net income		66,385			$ 64,245	$ 2,140											66,385
Dividends		(9,460)												73			(9,533)
Other comprehensive loss, net of tax		922																				922
Balance at end of period at Mar. 31, 2022		$ 469,086						$ 162			$ (46,448)			$ 112,924			$ 407,522					$ (5,074)

[1] The balances at March 31, 2019, 2020 and 2021 amounts have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 7 to the Consolidated Financial Statements.

[2] *Years ended March 31, 2021 and 2020 amounts have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 7 to the Consolidated Financial Statements.

[3] Years ended March 31, 2021 and 2020 amounts have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 7 to the Consolidated Financial Statements.

[4] *Year ended March 31, 2021 amounts have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 7 to the Consolidated Financial Statements.