Changes to Accumulated Other Comprehensive Loss, Net of Income Tax, By Component (Detail) (USD $) In Thousands, unless otherwise specified	4 Months Ended
	Apr. 20, 2013	Apr. 21, 2012
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, Gains(Losses) on Cash Flow Hedges, beginning balance	$ (4,100)
Other comprehensive income before reclassifications, Gains(Losses) on Cash Flow Hedges	(8,621)
Reclassified to earnings from accumulated other comprehensive income, Gains(Losses) on Cash Flow Hedges	1,007	10,036
Accumulated other comprehensive loss, Gains(Losses) on Cash Flow Hedges, ending balance	(11,714)
Accumulated other comprehensive loss, Defined Benefit Pension Plan Items, beginning balance	(110,567)
Other comprehensive income before reclassifications, Defined Benefit Pension Plan Items
Reclassified to earnings from accumulated other comprehensive income, Defined Benefit Pension Plan Items	969
Accumulated other comprehensive loss, Defined Benefit Pension Plan Items, ending balance	(109,598)
Accumulated other comprehensive loss, beginning balance	(114,667)
Other comprehensive income before reclassifications	(8,621)
Reclassified to earnings from accumulated other comprehensive income	1,976
Accumulated other comprehensive loss, ending balance	$ (121,312)