EARNINGS PER SHARE - Stock Split (Details) shares in Thousands		3 Months Ended	9 Months Ended
Oct. 31, 2017	Sep. 30, 2017 $ / shares shares	Sep. 24, 2016 $ / shares shares	Sep. 30, 2017 $ / shares shares	Sep. 24, 2016 $ / shares shares
Stock split
Stock split ratio	3
Pro forma earnings per share
Shares for calculating basic EPS - Post stock split basis \| shares		60,225	60,186	60,309	60,108
Shares for calculating diluted EPS - Post stock split basis \| shares		60,348	60,285	60,420	60,204
Net earnings per share (post stock split):
Basic \| $ / shares		$ 0.550	$ 0.450	$ 1.440	$ 1.320
Diluted \| $ / shares		$ 0.550	$ 0.450	$ 1.440	$ 1.310

Pro forma basic earnings per share or earnings per unit, which is commonly presented in initial public offerings based on the terms of the offering.

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Pro forma diluted earnings per share, which is commonly presented in initial public offerings.

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The weighted average number of shares or units and dilutive common stock or unit equivalents outstanding in the calculation of proforma diluted earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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The weighted average number of shares (units) outstanding in the calculation of pro forma basic earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.

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