Commitments and Contingencies Loss Contingency (Details)	3 Months Ended				12 Months Ended						3 Months Ended			9 Months Ended	1 Months Ended	3 Months Ended		12 Months Ended	1 Months Ended
	Jun. 25, 2011 USD ($)	Sep. 24, 2011 USD ($)	Dec. 25, 2010 USD ($)	Jun. 30, 2007 USD ($)	Dec. 31, 1990 Environmental matters, Lowry USD ($)	Sep. 24, 2011 Environmental matters, Lowry USD ($)	Sep. 24, 2011 Environmental matters, Cooper Drum site USD ($)	Oct. 31, 2006 Environmental matters, Cooper Drum site	Sep. 24, 2011 Environmental matters, Rutherford and Berrys Creek site USD ($)	Sep. 24, 2011 Kaiser purchased tax credits indemnity reserve USD ($) categories	Jun. 26, 2010 Kaiser purchased tax credits indemnity reserve, category one USD ($)	Dec. 26, 2009 Kaiser purchased tax credits indemnity reserve, category one USD ($)	Sep. 24, 2011 Kaiser purchased tax credits indemnity reserve, category two USD ($)	Sep. 24, 2011 Kaiser tax, civil and labor indemnity reserve USD ($)	Oct. 31, 2010 Litigation on product distribution in Brazil USD ($)	Mar. 27, 2010 Litigation on product distribution in Brazil USD ($)	Sep. 26, 2009 Litigation on product distribution in Brazil USD ($)	Dec. 31, 2000 Litigation on product distribution in Brazil USD ($)	Sep. 30, 2011 BRI CAD	Jun. 25, 2011 BRI CAD
Loss Contingencies [Line Items]
Loss contingency, number of categories										2
Cash Settlement											$ 96,000,000
Maximum potential claims eliminated											284,500,000
Indemnity liability, current										8,800,000		131,200,000
Maximum potential claims													241,600,000	68,000,000
Total estimate of indemnity liability										21,900,000
Indemnity liability, noncurrent										13,100,000				9,200,000
Equity interest sold (as a percent)														68.00%
Guarantees
Debt face amount				575,000,000																200,000,000
Guarantees related to banks and other third parties noncurrent portion		6,100,000	6,200,000
Gain on liability reduction recorded in special items	2,000,000
Payments of Capital Distribution																			92,700,000
Guarantees related to banks and other third parties			100,400,000
Guarantees related to banks and other third parties current portion			94,200,000
Litigation and Other Disputes
Settlement agreement, payment for termination of distribution agreement																		150,000
Litigation, vacated court judgment															42,000,000	42,000,000	42,000,000
Environmental
Environmental remediation expense, pretax charge					30,000,000
Environmental remediation threshold, assumed remediation cost						120,000,000
Inflation rate assumption, future costs (as a percent)						2.50%
Risk free rate of return assumption (as a percent)						1.67%
Site contingency, accrual, present value						4,300,000
Site contingency, accrual, undiscounted amount						5,300,000
Number of PRP parties								60
Accrued estimated liabilities, environmental							$ 200,000		$ 4,100,000