Consolidated Statements 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, 2014	38,017	6,663
Balance at Mar. 31, 2014	$ 206,670	$ (58,782)	$ 117,715	$ 5,029	$ 270,632
Net income			23,740		23,740
Other comprehensive income (loss)				(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
Dividends			(4,263)		(4,263)
Balances (in shares) at Mar. 31, 2015	38,117	6,442
Balance at Mar. 31, 2015	$ 210,088	$ (56,833)	137,134	(23,088)	267,301
Net income			14,741		14,741
Other comprehensive income (loss)				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
Dividends			(4,896)		(4,896)
Balances (in shares) at Mar. 31, 2016	38,214	6,839
Balance at Mar. 31, 2016	$ 214,427	$ (61,845)	146,979	(20,266)	279,295
Net income			21,348		21,348
Other comprehensive income (loss)				(8,279)	(8,279)
Stock-based compensation	$ 3,438				3,438
Proceeds from sale of shares through employee equity incentive plans, related excess tax benefits and others (in shares)	112
Proceeds from sale of shares through employee equity incentive plans, related excess tax benefits and others	$ (127)				(127)
Purchase of treasury stock (in shares)		96
Purchase of treasury stock		$ (1,213)			(1,213)
Re-issuance of treasury stock under stock compensation plans (in shares)		(521)
Re-issuance of treasury stock under stock compensation plans		$ 4,711	(60)		4,651
Dividends			(1,258)		(1,258)
Balances (in shares) at Mar. 31, 2017	38,326	6,414
Balance at Mar. 31, 2017	$ 217,738	$ (58,347)	$ 167,009	$ (28,545)	$ 297,855