Significant Accounting Policies (Calculations of Basic Earnings per Common Share and Earnings per Common Share - Assuming Dilution) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 25, 2011	Sep. 25, 2011	Jun. 26, 2011	Mar. 27, 2011	Dec. 26, 2010		Sep. 26, 2010		Jun. 27, 2010		Mar. 28, 2010		Dec. 25, 2011	Dec. 26, 2010	Dec. 27, 2009
Basic earnings per common share:
Net income, net of noncontrolling interests	$ 15,981	$ 11,123	$ 12,124	$ 16,427	$ 14,025	[1]	$ 7,848	[1]	$ 13,192	[1]	$ 16,875	[1]	$ 55,655	$ 51,940	$ 57,453
Weighted average shares outstanding													25,043	26,328	27,738
Basic earnings per common share	$ 0.66	$ 0.45	$ 0.48	$ 0.64	$ 0.55	[1]	$ 0.30	[1]	$ 0.49	[1]	$ 0.62	[1]	$ 2.22	$ 1.97	$ 2.07
Earnings per common share - assuming dilution:
Net income, net of noncontrolling interests	$ 15,981	$ 11,123	$ 12,124	$ 16,427	$ 14,025	[1]	$ 7,848	[1]	$ 13,192	[1]	$ 16,875	[1]	$ 55,655	$ 51,940	$ 57,453
Weighted average shares outstanding													25,043	26,328	27,738
Dilutive effect of outstanding equity awards													267	140	171
Diluted weighted average shares outstanding													25,310	26,468	27,909
Earnings per common share - assuming dilution	$ 0.65	$ 0.44	$ 0.47	$ 0.64	$ 0.55	[1]	$ 0.30	[1]	$ 0.49	[1]	$ 0.62	[1]	$ 2.20	$ 1.96	$ 2.06

[1] During 2010, we recorded pre-tax income of $3.5 million ($2.2 million after tax or $0.08 per diluted share) in the first quarter, pre-tax income of $2.7 million ($1.7 million after tax or $0.06 per diluted share) in the second quarter, pre-tax losses of $658,000 ($417,000 after tax or $0.02 per diluted share) in the third quarter and pre-tax income of $1.3 million ($843,000 after tax or $0.04 per diluted share) in the fourth quarter upon consolidation of BIBP. BIBP's total pre-tax income, excluding the reduction in BIBP's cost of sales of $14.2 million associated with PJFS's agreement to pay to BIBP for past cheese purchases an amount equal to its accumulated deficit, for 2010 was $6.8 million ($4.3 million after tax or $0.16 per diluted share).