Statement of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity Attributable to Parent	$ (128,485)
Common Stock, Shares, Outstanding	55,771	54,679
Beginning balance at Sep. 27, 2015			$ 547	$ 247,302	$ (390,966)	$ (16,276)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax						(11,001)
Other Comprehensive Income (Loss), Tax						4,499
Net Income (Loss)	$ 36,019				36,019
Net Income (Loss) Attributable to Noncontrolling Interest	1,058				(1,058)
Share-based Compensation				2,306
Stock Issued During Period, Value, New Issues			11	132
Stock Issued During Period, Shares, New Issues		1,092
Ending balance at Sep. 25, 2016			558	249,740	(356,005)	(22,778)
Cumulative Effect on Retained Earnings, Net of Tax					0
Common Stock, Shares, Outstanding		55,771
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax						11,439
Other Comprehensive Income (Loss), Tax						(4,729)
Net Income (Loss)	28,605				28,605
Net Income (Loss) Attributable to Noncontrolling Interest	1,124				(1,124)
Share-based Compensation				2,088
Stock Issued During Period, Value, New Issues			9	(38)
Stock Issued During Period, Shares, New Issues		941
Ending balance at Sep. 24, 2017	(91,213)		567	251,790	(328,524)	(16,068)
Cumulative Effect on Retained Earnings, Net of Tax					0
Stockholders' Equity Attributable to Parent	$ (92,235)
Common Stock, Shares, Outstanding	56,712	56,712
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax						10,477
Other Comprehensive Income (Loss), Tax						(3,088)
Net Income (Loss)	$ 47,048				47,048
Net Income (Loss) Attributable to Noncontrolling Interest	1,282				(1,282)
Share-based Compensation				2,039
Stock Issued During Period, Value, New Issues			5	(318)
Stock Issued During Period, Shares, New Issues		429
Ending balance at Sep. 30, 2018	(36,260)		$ 572	$ 253,511	(279,691)	$ (11,746)
Cumulative Effect on Retained Earnings, Net of Tax					$ (3,067)
Stockholders' Equity Attributable to Parent	$ (37,354)
Common Stock, Shares, Outstanding	57,141	57,141