SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Jan. 31, 2018

Accounting Policies [Abstract]

Schedule of numerators and denominators used in the calculation of basic and diluted net income per share

	Year Ended January 31,
	2018			2017			2016
	(In thousands, except per share amounts)
Net income		$	62,124		$	51,938		$	114,333
Basic net income per share:
Basic common shares			48,820			46,308			45,328
Basic net income per share		$	1.27		$	1.12		$	2.52
Diluted net income per share:
Basic common shares			48,820			46,308			45,328
Stock options and restricted stock unit awards			930			1,086			1,184
Diluted common shares			49,750			47,394			46,512
Diluted net income per share		$	1.25		$	1.10		$	2.46