Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
OPERATING ACTIVITIES:
Net income	$ 35,868	$ 20,582
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,401	7,184
Change in fair value of acquisition-related contingent consideration	403	145
Long-lived asset impairment loss	0	259
Loss from equity investment	0	154
Gain from sale of equity method investment	(5,785)	0
Deferred income taxes	(439)	(942)
Share-based compensation expense	2,281	1,932
Other operating activities, net	(1,987)	174
Change in operating assets and liabilities:
Accounts receivable	(2,982)	(3,279)
Inventories	(792)	(8,466)
Other assets	74	(1,257)
Operating liabilities	4,610	3,375
Net cash provided by operating activities	38,652	19,861
INVESTING ACTIVITIES:
Capital expenditures	(6,853)	(5,223)
Proceeds from sale or maturity of investments	6,668	250
Purchases of investments	(164)	(255)
Proceeds (disbursements) from sale of assets, settlement of liabilities	832	(344)
Other investing activities	(1,971)	(17)
Net cash used in investing activities	(1,488)	(5,589)
FINANCING ACTIVITIES:
Dividends paid	(9,326)	(9,384)
Payments of acquisition-related contingent liability	(499)	(320)
Restricted stock units vested and issued	(679)	(151)
Employee stock options exercises	(1,251)	(148)
Other financing activities	(102)	0
Net cash used in financing activities	(11,857)	(10,003)
Effect of exchange rate changes on cash	(403)	280
Net increase in cash and cash equivalents	24,904	4,549
Cash and cash equivalents at beginning of year	40,535	50,648
Cash and cash equivalents at end of period	$ 65,439	$ 55,197