STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Jan. 31, 2016

Stockholders' Equity Note [Abstract]

Schedule of restricted stock

	Awards Outstanding			Weighted Average Grant Date Fair Value
Unvested as of January 31, 2014		2,240,354		$	18.48
Granted		522,170		$	34.26
Vested		(667,062	)	$	14.08
Canceled		(4,050	)	$	27.44
Unvested as of January 31, 2015		2,091,412		$	23.80
Granted		507,319		$	47.36
Vested		(549,848	)	$	19.40
Canceled		—		$	—
Unvested as of January 31, 2016		2,048,883		$	30.79

Schedule of information regarding stock options

	2016					2015					2014
	Shares			Weighted Average Exercise		Shares			Weighted Average Exercise		Shares			Weighted Average Exercise
Stock options outstanding at beginning of year		469,176		$	11.16		536,976		$	11.11		764,108		$	10.40
Exercised		(37,525	)	$	11.11		(67,800	)	$	10.76		(219,532	)	$	8.68
Granted		—		$	—		—		$	—		—		$	—
Cancelled or forfeited		(100,000	)	$	13.08		—		$	—		(7,600	)	$	9.70
Stock options outstanding at end of year		331,651		$	10.59		469,176		$	11.16		536,976		$	11.11
Exercisable		253,151		$	9.07		250,176		$	8.63		318,476		$	9.33

Schedule of information about stock options outstanding

Range of Exercise Prices	Number Outstanding as of January 31, 2016		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price		Number Exercisable as of January 31, 2016		Weighted Average Exercise Price
$0.00 – $8.00		115,000		2.22	$	6.59		115,000	$	6.59
$8.01 – $12.00		86,585		1.56	$	9.23		86,585	$	9.23
$12.01 – $16.00		112,400		6.02	$	14.61		36,400	$	12.98
$16.01 – $40.00		17,666		6.12	$	17.76		15,166	$	17.70
		331,651						253,151