Quarterly Data - Unaudited (Detail) (USD $)	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
Quarterly Financial Information [Line Items]
Total revenues	$ 306,213,000	$ 305,668,000	$ 293,534,000	$ 312,467,000	$ 286,838,000		$ 273,126,000		$ 280,647,000		$ 285,786,000		$ 1,217,882,000	$ 1,126,397,000	$ 1,078,550,000
Operating income	23,693,000	16,958,000	19,155,000	27,211,000	22,220,000	[1]	13,783,000	[1]	22,799,000	[1]	27,942,000	[1]	87,017,000	86,744,000	95,218,000
Net income	15,981,000	11,123,000	12,124,000	16,427,000	14,025,000	[1]	7,848,000	[1]	13,192,000	[1]	16,875,000	[1]	55,655,000	51,940,000	57,453,000
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	$ 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
BIBP Commodities, Inc. [Member]
Quarterly Financial Information [Line Items]
Operating income					1,300,000		(658,000)		2,700,000		3,500,000
Net income					843,000		(417,000)		1,700,000		2,200,000
Earnings per common share - assuming dilution					$ 0.04		$ (0.02)		$ 0.06		$ 0.08
Operating income, excluding reduction in cost of sales associated with agreement to pay for past cheese purchases														6,800,000
Net income, excluding reduction in cost of sales associated with agreement to pay for past cheese purchases														4,300,000
Earnings per common share - assuming dilution, excluding reduction in cost of sales associated with agreement to pay for past cheese purchases														$ 0.16
Increase (decrease) in cost of sales compared to prior year														$ (14,200,000)

[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).