Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock Including Additional Paid in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Mar. 31, 2013	37,921	7,036
Balances at Mar. 31, 2013	$ 202,977	$ (61,994)	$ 115,718	$ (3,093)	$ 253,608
Net income			$ 6,046		6,046
Other comprehensive income				$ 8,122	8,122
Stock-based compensation	$ 2,785				2,785
Proceeds from sale of shares through employee equity incentive plans, related excess tax benefits and others (in shares)	96
Proceeds from sale of shares through employee equity incentive plans, related excess tax benefits and others	$ 908				908
Purchase of treasury stock (in shares)		60
Purchase of treasury stock		$ (602)			(602)
Re-issuance of treasury stock under stock compensation plans (in shares)		(433)
Re-issuance of treasury stock under stock compensation plans		$ 3,814	$ (305)		3,509
Dividend			(3,744)		(3,744)
Balances (in shares) at Mar. 31, 2014	38,017	6,663
Balances at Mar. 31, 2014	$ 206,670	$ (58,782)	117,715	$ 5,029	270,632
Net income			$ 23,740		23,740
Other comprehensive income				$ (28,117)	(28,117)
Stock-based compensation	$ 2,867				2,867
Proceeds from sale of shares through employee equity incentive plans, related excess tax benefits and others (in shares)	100
Proceeds from sale of shares through employee equity incentive plans, related excess tax benefits and others	$ 551				551
Re-issuance of treasury stock under stock compensation plans (in shares)		(221)
Re-issuance of treasury stock under stock compensation plans		$ 1,949	$ (58)		1,891
Dividend			(4,263)		(4,263)
Balances (in shares) at Mar. 31, 2015	38,117	6,442
Balances at Mar. 31, 2015	$ 210,088	$ (56,833)	137,134	$ (23,088)	267,301
Net income			$ 14,741		14,741
Other comprehensive income				$ 2,822	2,822
Stock-based compensation	$ 3,343				3,343
Proceeds from sale of shares through employee equity incentive plans, related excess tax benefits and others (in shares)	97
Proceeds from sale of shares through employee equity incentive plans, related excess tax benefits and others	$ 996				996
Purchase of treasury stock (in shares)		772
Purchase of treasury stock		$ (8,352)			(8,352)
Re-issuance of treasury stock under stock compensation plans (in shares)		(375)
Re-issuance of treasury stock under stock compensation plans		$ 3,340			3,340
Dividend			$ (4,896)		(4,896)
Balances (in shares) at Mar. 31, 2016	38,214	6,839
Balances at Mar. 31, 2016	$ 214,427	$ (61,845)	$ 146,979	$ (20,266)	$ 279,295