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Acquisitions (Details) - USD ($) $ in Thousands	Oct. 03, 2015	Dec. 27, 2014	Oct. 04, 2014
Assets acquired and liabilities assumed:
Goodwill	$ 20,142	$ 14,875	$ 13,242
Goalsetter [Member]
Assets acquired and liabilities assumed:
Accounts receivable	801
Inventories	968
Other assets	51
Goodwill	5,267
Intangible assets	6,180
Accounts payable	(259)
Other liabilities	(73)
Deferred income tax liability	(2,035)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total	$ 10,900