Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 24, 2016
Other Liabilities Disclosure [Abstract]
Customer prepayments & deposits	$ 3,956	$ 3,115
Total other liabilities, current	3,956	3,115
Foreign exchange contract liabilities		12
Other payables, net of current portion	2,390	3,454
Asset retirement obligations	648	921
Pension liability	10,858	7,975
Total other liabilities, long-term	13,896	12,362
Other liabilities	$ 17,852	$ 15,477