Acquisitions Acquisitions - Vantage Endoscopy Inc. (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 26, 2016	Jul. 31, 2017
Vantage Endoscopy Inc
Business Acquisition [Line Items]
Total consideration for the transaction, excluding acquisition-related costs	$ 4,044	$ 4,044	[1]

[1] The excess purchase price over net assets acquired was assigned to goodwill, all of which is deductible for income tax purposes.