Stock Based Compensation (Stock Options - Outstanding and Exercisable) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012	Dec. 30, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 26.41	$ 25.74	$ 24.12	$ 23.90
Remaining Contractual Life	4 years 7 months 4 days
Outstanding	2,115,606	3,972,795	5,195,134	4,737,052
Outstanding Intrinsic Value	$ 15.4
Exercisable	994,606	2,349,795	3,460,134
Exercisable Intrinsic Value	7.0
Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 14.77
Remaining Contractual Life	4 years 4 months 4 days
Outstanding	30,000
Outstanding Intrinsic Value	0.6
Exercisable	30,000
Exercisable Intrinsic Value	0.6
Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 15.78
Remaining Contractual Life	1 year 7 months 18 days
Outstanding	14,000
Outstanding Intrinsic Value	0.2
Exercisable	14,000
Exercisable Intrinsic Value	0.2
Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 17.35
Remaining Contractual Life	2 years 2 months 1 day
Outstanding	6,250
Outstanding Intrinsic Value	0.1
Exercisable	6,250
Exercisable Intrinsic Value	0.1
Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 18.31
Remaining Contractual Life	1 year 4 months 6 days
Outstanding	6,000
Outstanding Intrinsic Value	0.1
Exercisable	6,000
Exercisable Intrinsic Value	0.1
Range 5 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 19.76
Remaining Contractual Life	1 year 2 months 3 days
Outstanding	6,250
Outstanding Intrinsic Value	0.1
Exercisable	6,250
Exercisable Intrinsic Value	0.1
Range 6 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 19.83
Remaining Contractual Life	4 years 1 month 29 days
Outstanding	12,500
Outstanding Intrinsic Value	0.2
Exercisable	12,500
Exercisable Intrinsic Value	0.2
Range 7 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 20.13
Remaining Contractual Life	5 years 2 months 5 days
Outstanding	0
Outstanding Intrinsic Value	0
Exercisable	0
Exercisable Intrinsic Value	0
Range 8 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 21.72
Outstanding	105,005
Outstanding Intrinsic Value	1.3
Exercisable	105,005
Exercisable Intrinsic Value	1.3
Range 9 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 22.25
Remaining Contractual Life	3 years 7 months 3 days
Outstanding	78,682
Outstanding Intrinsic Value	0.9
Exercisable	78,682
Exercisable Intrinsic Value	0.9
Range 10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 22.46
Remaining Contractual Life	7 years 2 months 2 days
Outstanding	64,400
Outstanding Intrinsic Value	0.7
Exercisable	0
Exercisable Intrinsic Value	0
Range 11 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 23.76
Remaining Contractual Life	6 years 7 months 7 days
Outstanding	268,219
Outstanding Intrinsic Value	2.6
Exercisable	108,219
Exercisable Intrinsic Value	1.1
Range 12 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 24.29
Remaining Contractual Life	7 years 7 months 5 days
Outstanding	398,810
Outstanding Intrinsic Value	3.7
Exercisable	98,810
Exercisable Intrinsic Value	0.9
Range 13 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 26.52
Remaining Contractual Life	8 years 2 months 24 days
Outstanding	108,816
Outstanding Intrinsic Value	0.8
Exercisable	12,216
Exercisable Intrinsic Value	0.1
Range 14 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 26.67
Remaining Contractual Life	6 years 2 months 3 days
Outstanding	32,200
Outstanding Intrinsic Value	0.2
Exercisable	0
Exercisable Intrinsic Value	0
Range 15 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 28.01
Remaining Contractual Life	8 years 7 months 4 days
Outstanding	116,200
Outstanding Intrinsic Value	0.7
Exercisable	29,800
Exercisable Intrinsic Value	0.2
Range 16 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 28.09
Remaining Contractual Life	8 years 7 months 4 days
Outstanding	303,784
Outstanding Intrinsic Value	1.7
Exercisable	51,184
Exercisable Intrinsic Value	0.3
Range 17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 28.89
Remaining Contractual Life	9 years 5 months 4 days
Outstanding	161,000
Outstanding Intrinsic Value	0.8
Exercisable	32,200
Exercisable Intrinsic Value	0.2
Range 18 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 29.84
Remaining Contractual Life	0 years 4 months 0 days
Outstanding	186,240
Outstanding Intrinsic Value	0.7
Exercisable	186,240
Exercisable Intrinsic Value	0.7
Range 19 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 30.59
Remaining Contractual Life	2 years 11 months 3 days
Outstanding	0
Outstanding Intrinsic Value	0
Exercisable	0
Exercisable Intrinsic Value	0
Range 20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 32.28
Remaining Contractual Life	0 years 1 month 20 days
Outstanding	25,000
Outstanding Intrinsic Value	0
Exercisable	25,000
Exercisable Intrinsic Value	0
Range 21 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 33.97
Remaining Contractual Life	3 years 2 months 0 days
Outstanding	161,000
Outstanding Intrinsic Value	0
Exercisable	161,000
Exercisable Intrinsic Value	0
Range 22 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 33.97
Remaining Contractual Life	3 years 2 months 0 days
Outstanding	31,250
Outstanding Intrinsic Value	0
Exercisable	31,250
Exercisable Intrinsic Value	$ 0