Earnings Per Share ("EPS") (Tables)

6 Months Ended

Jul. 31, 2014

Earnings Per Share [Abstract]

Earnings Per Share Basic And Diluted

	Three months ended July 31,				Six months ended July 31,
	2014		2013		2014		2013
Net income	$	39,328	$	14,695	$	52,795	$	32,455
Weighted-average common shares - basic	38,244		38,043		38,191		37,976
Effect of dilutive securities:
Equity-based awards	124		137		151		201
Weighted-average common shares - diluted	38,368		38,180		38,342		38,177
Net income per share:
Basic	$	1.03	$	0.39	$	1.38	$	0.85
Diluted	$	1.03	$	0.38	$	1.38	$	0.85