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New accounting standards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 02, 2017	Mar. 27, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash (used in) provided by operating activities from continuing operations	$ 90,940	$ 66,832
Net income	$ 40,170	$ 50,689
Net income (in dollars per share)	$ 0.86	$ 1.04
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash (used in) provided by operating activities from continuing operations	$ 3,400
Net income	$ 3,400
Net income (in dollars per share)	$ 0.07

X

- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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