Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (7,839)	$ (8,523)
Other comprehensive income, net of tax
Net change in defined benefit pension plan	563	1,006
Net unrealized gain on cash flow hedges	0	149
Total other comprehensive income	563	1,155
Comprehensive loss	$ (7,276)	$ (7,368)