Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	Retained Earnings Including Noncontrolling Interests [Member]	AOCI Attributable to Parent [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	AOCI Attributable to Parent [Member]	Total
Balance, beginning of year at Sep. 24, 2017	$ 567	$ 251,790		$ (328,524)			$ (16,068)
Balance, beginning of year (in shares) at Sep. 24, 2017	56,712
Shares issued	$ 5	(318)
Shares issued (in shares)	429
Balance, beginning of year at Sep. 30, 2018	$ 572	253,511	$ 3,067	(279,691)		$ (3,067)	(11,746)	$ (37,354)
Balance, end of year (in shares) at Sep. 30, 2018	57,141							57,141
Stock compensation		2,039
Net (loss) income					$ 47,048			$ 47,048
Net income attributable to non-controlling interests				(1,282)				1,282
Change in pension and postretirement benefits							10,477
Deferred income taxes, net							(3,088)
Shares issued	$ 5	(75)
Shares issued (in shares)	505
Balance, beginning of year at Sep. 29, 2019	$ 577	255,476	0	(265,423)		0	(29,114)	$ (38,484)
Balance, end of year (in shares) at Sep. 29, 2019	57,646							57,646
Stock compensation		2,040
Net (loss) income					15,909			$ 15,909
Net income attributable to non-controlling interests				(1,641)				1,641
Change in pension and postretirement benefits							(24,667)
Deferred income taxes, net							7,299
Shares issued	$ 7	(87)
Shares issued (in shares)	707
Balance, beginning of year at Sep. 27, 2020	$ 584	256,431	$ 0	(268,529)		$ 0	(20,050)	$ (31,564)
Balance, end of year (in shares) at Sep. 27, 2020	58,353							58,353
Stock compensation		$ 1,042
Net (loss) income					$ (1,261)			$ (1,261)
Net income attributable to non-controlling interests				$ (1,845)				$ 1,845
Change in pension and postretirement benefits							11,464
Deferred income taxes, net							$ (2,400)