Restructuring Charges - As a Component of Selling, General and Administrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 25, 2016	Mar. 31, 2017	Mar. 25, 2016
Restructuring and Related Activities [Abstract]
Severance-related and other charges	$ 412	$ 775	$ 801	$ 2,069