Employee Benefit Plans (Tables)

12 Months Ended

Jan. 31, 2012

Employee Benefit Plans [Abstract]

Schedule Of Restricted Stock Units Activity

	Shares			Weighted- average grant date fair value
Outstanding at January 31, 2011		543,841		$	38.60
Granted		272,949			48.53
Vested		(210,094	)		37.40
Canceled		(38,198	)		41.35
Outstanding at January 31, 2012		568,498			43.74

Schedule Of Stock Options Activity

	Shares			Weighted- average exercise price		Weighted- Average remaining contractual term (in years)		Aggregate intrinsic value (in thousands)
Outstanding at January 31, 2011		2,881,356		$	35.36
Granted		12,882			48.79
Exercised		(1,215,028	)		37.76
Canceled		(27,810	)		23.95
Outstanding at January 31, 2012		1,651,400			33.89		4.2	$	29,783
Vested and expected to vest at January 31, 2012		1,638,799			33.95		4.1		29,444
Exercisable at January 31, 2012		1,296,587			36.72		3.3		19,712

Summary Of The Status Of Stock-Based Equity Incentives Outstanding

	Outstanding						Exercisable
Range of exercise prices	Number outstanding at 1/31/12		Weighted- average remaining contractual life (years)		Weighted- average exercise price		Number exercisable at 1/31/12		Weighted- average exercise price
$21.13 – $21.13		339,766		7.1	$	21.13		23,648	$	21.13
24.04 – 35.38		340,329		3.9		31.80		332,914		31.81
35.95 – 36.66		84,000		4.5		36.58		84,000		36.58
37.04 – 37.04		295,130		4.2		37.04		295,130		37.04
37.06 – 41.08		450,116		2.7		39.24		446,725		39.25
41.55 – 48.79		138,559		2.2		44.09		110,670		43.38
51.17 – 51.17		3,500		0.1		51.17		3,500		51.17
		1,651,400		4.2		33.89		1,296,587		36.72