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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
REVENUES $ 203,779 $ 184,993 $ 170,860
COST OF REVENUES 56,051 53,859 54,879
GROSS MARGIN 147,728 131,134 115,981
EXPENSES      
Sales and marketing 24,943 22,424 20,404
Research and development 35,556 31,293 28,077
General and administrative 23,077 21,607 20,333
3,455 1,492 2,876
Amortization of intangible assets 30,001 26,222 21,715
117,032 103,037 93,405
INCOME FROM OPERATIONS 30,696 28,097 22,576
INTEREST EXPENSE (611) (522) (1,088)
INVESTMENT INCOME 1,415 195 333
INCOME BEFORE INCOME TAXES 31,500 27,770 21,821
INCOME TAX EXPENSE (Note 17)      
Current 4,022 1,443 2,784
Deferred tax expense 3,640 5,765 3,978
7,662 7,208 6,762
NET INCOME $ 23,838 $ 20,562 $ 15,059
Earnings per share      
Basic (in dollars per share) $ 0.31 $ 0.27 $ 0.21
Diluted (in dollars per share) $ 0.31 $ 0.27 $ 0.21
WEIGHTED AVERAGE SHARES OUTSTANDING (thousands)      
Basic (in shares) 75,800 75,595 70,559
Diluted (in shares) 76,515 76,409 71,584