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Number of share options (or share units) exercised during the current period.

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STOCK-BASED COMPENSATION (Details 2) (USD $)	6 Months Ended		6 Months Ended		1 Months Ended		6 Months Ended	1 Months Ended		6 Months Ended	1 Months Ended	6 Months Ended
STOCK-BASED COMPENSATION (Details 2) (USD $)	Jul. 30, 2011 Stock Option Plans	Jan. 29, 2011 Stock Option Plans	Jul. 30, 2011 Deferred and Restricted Stock ("Deferred Awards")	Jul. 30, 2011 Deferred stock awards	Mar. 31, 2011 Deferred stock awards Chief Executive Officer and President	Mar. 28, 2011 Deferred stock awards Chief Executive Officer and President	Jul. 30, 2011 Deferred stock awards Employee and new hire awards	May 31, 2011 Deferred stock awards Board of Directors	Jan. 29, 2011 Deferred stock awards Board of Directors	Jul. 30, 2011 Performance awards	Mar. 31, 2011 Performance awards Chief Executive Officer and President	Jul. 30, 2011 Performance awards Employee and new hire awards
Stock-based compensation
Vesting period (in years)				3 years				1 year	1 year	3 years		3 years
Minimum percentage of Target Shares which can be earned by the participants (as a percent)											50.00%	50.00%
Maximum percentage of Target Shares that can be earned by the participants (as a percent)										200.00%	200.00%	200.00%
Percentage of Target Shares paid out if final operating income below threshold (as a percent)											0.00%	0.00%
Percentage of the award vesting at first anniversary (as a percent)						50.00%
Percentage of the award vesting at second anniversary (as a percent)						25.00%
Percentage of the award vesting at third anniversary (as a percent)						25.00%
Ratio of awards vested on each anniversary, numerator							1
Ratio of awards vested on each anniversary, denominator							3
Deferred and Performance Awards
Unvested awards at the beginning of the period (in shares)			356,000							151,000
Granted (in shares)			282,000		100,725		161,704	1,376	18,640	227,000	100,725	126,176
Vested (in shares)			(104,000)							(144,000)
Forfeited (in shares)			(41,000)							(1,000)
Unvested awards at the end of the period (in shares)			493,000							233,000
Weighted Average Grant Date Fair Value
Unvested awards at the beginning of the period (in dollars per share)			$ 36.91							$ 25.16
Granted (in dollars per share)			$ 50.94							$ 51.45
Vested (in dollars per share)			$ 32.08							$ 24.05
Forfeited (in dollars per share)			$ 39.15							$ 52.70
Unvested awards at the end of the period (in dollars per share)			$ 45.78							$ 51.27
Percentage of target shares earned used in computation of unvested awards (as a percent)										100.00%
Target shares expected to be earned, weighted-average percentage (as a percent)										80.00%
Unrecognized costs and period of recognition
Unrecognized stock-based compensation expense (in dollars)			$ 17,900,000							$ 8,600,000
Weighted average period for recognition of unrecognized stock-based compensation expense (in years)			2.4							2.6
Number of Options
Options outstanding at the beginning of the period (in shares)	351,000
Exercised (in shares)	(84,000)
Forfeited (in shares)	(6,000)
Options outstanding at the end of the period (in shares)	261,000
Weighted Average Exercise Price
Options outstanding at the beginning of the period (in dollars per share)	$ 33.93
Exercised (in dollars per share)	$ 32.68
Forfeited (in dollars per share)	$ 39.09
Options outstanding at the end of the period (in dollars per share)	$ 34.21
Weighted Average Remaining Contractual Life (in years)
Options outstanding at the beginning of the period (in years)	4.3
Options outstanding at the end of the period (in years)	4.1
Aggregate Intrinsic Value
Options outstanding at the beginning of the period (in dollars)	3,311,000
Exercised (in dollars)	1,518,000
Forfeited (in dollars)	89,000
Options outstanding at the end of the period (in dollars)	$ 3,707,000
Changes in Unvested Stock Options
Unvested stock options (in shares)		16,000
Weighted Average Grant Date Fair Value, unvested stock options
Unvested stock options (in dollars per share)		$ 11.08