Earnings Per Share - Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
Numerator
Net earnings	$ 36,892	$ 28,433	$ 97,202	$ 55,045
Net earnings allocated to participating securities (restricted stock and deferred stock units) - basic		(33)		(65)
Net earnings allocated to participating securities (restricted stock and deferred stock units) - diluted		(33)		(65)
Net earnings (loss) allocated to common shareholders - basic	36,892	28,400	97,202	54,980
Net earnings (loss) allocated to common shareholders - diluted	$ 36,892	$ 28,400	$ 97,202	$ 54,980
Denominator
Basic weighted-average common shares outstanding (in shares)	49,206	48,655	49,040	48,570
Dilutive effect of share-based awards (in shares)	224	157	211	121
Diluted weighted-average common shares outstanding (in shares)	49,430	48,812	49,251	48,691
Net earnings (loss) per common share allocated to common shareholders:
Basic (in dollars per share)	$ 0.75	$ 0.58	$ 1.98	$ 1.13
Diluted (in dollars per share)	$ 0.75	$ 0.58	$ 1.97	$ 1.13

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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