Property, Plant and Equipment - Additional information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 03, 2015	Oct. 04, 2014	Oct. 03, 2015	Oct. 04, 2014	Dec. 31, 2013	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 7,600,000		$ 7,600,000			$ 7,170,000
Property, plant and equipment net of accumulated depreciation, under a capital lease agreement	20,900		20,900			22,800
Gross property, plant and equipment acquired under capital lease	25,400		25,400
Total obligations associated with capital lease agreement	21,600		21,600			23,200
Capital lease obligations classified in accrued expenses and other current liabilities	2,300		2,300			2,200
Capital lease obligations classified in deferred credits and other liabilities	19,300		19,300			21,000
Initial payments from insurance receivables			10,300
Net charge associated with write-down of two remaining storage domes included in marketing, administrative and other expenses	124,339	$ 152,604	377,492	$ 418,851
Property, plant and equipment, net	5,040,902		5,040,902			5,287,639
First of Three Storage Domes [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment written down					$ 21,000
Inventory written down					7,000
Insurance receivable					$ 14,000
Three Iron Ore Storage Domes [Member]
Property, Plant and Equipment [Line Items]
Insurance receivable	15,400		15,400
Two Remaining Storage Domes [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment written down			19,400
Insurance receivable	11,700		11,700
Net charge associated with write-down of two remaining storage domes included in marketing, administrative and other expenses			7,700
Net fixed assets associated with anticipated further development activities at the St. James Parish Site [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 84,100		$ 84,100			$ 84,100