Net Income per Common Share (Tables)

9 Months Ended

Oct. 31, 2013

Earnings Per Share [Abstract]

Schedule of reconciliation between basic and diluted net income per share

	Three Months Ended October 31,				Nine Months Ended October 31,
	2013		2012		2013		2012
	(In thousands, except per share amounts)
Net income	$	59,595	$	48,291	$	64,305	$	48,805
Basic net income per share:
Basic common shares		20,399		20,053		20,290		19,971
Basic net income per share	$	2.92	$	2.41	$	3.17	$	2.44
Diluted net income per share:
Basic common shares		20,399		20,053		20,290		19,971
Restricted stock awards and stock options		512		348		528		338
Diluted common shares		20,911		20,401		20,818		20,309
Diluted net income per share	$	2.85	$	2.37	$	3.09	$	2.40