Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
OPERATING ACTIVITIES:
Net income	$ 12,348	$ 5,519
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,614	3,762
Change in fair value of acquisition-related contingent consideration	91	63
Long-lived asset impairment loss	259	0
Loss from equity investment	110	3
Deferred income taxes	(783)	1,651
Share-based compensation expense	791	456
Other operating activities, net	174	(78)
Change in operating assets and liabilities:
Accounts receivable	(8,623)	(2,648)
Inventories	(7,519)	(980)
Other assets	(1,041)	(1,071)
Operating liabilities	8,281	4,427
Net cash provided by operating activities	7,702	11,104
INVESTING ACTIVITIES:
Capital expenditures	(2,790)	(791)
Purchase of investments	0	(500)
Proceeds from sale of assets	14	50
Other investing activities	(60)	(194)
Net cash used in investing activities	(2,836)	(1,435)
FINANCING ACTIVITIES:
Dividends paid	(4,691)	(4,701)
Payments for common shares repurchased	0	(5,702)
Payments of acquisition-related contingent liability	(161)	(138)
Restricted stock units vested and issued	(152)	(256)
Employee stock options exercises	11	0
Net cash used in financing activities	(4,993)	(10,797)
Effect of exchange rate changes on cash	(44)	136
Net (decrease) in cash and cash equivalents	(171)	(992)
Cash and cash equivalents at beginning of year	50,648	33,782
Cash and cash equivalents at end of period	$ 50,477	$ 32,790