Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0.9	$ 0.9	$ 1.8	$ 1.9
Expected return on assets	(1.1)	(1.0)	(2.1)	(2.0)
Amortization of net loss	0.9	0.4	1.7	0.8
Net periodic pension cost	0.7	0.3	1.4	0.7
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.1	0.2	0.3	0.4
Expected return on assets	0	0	0	0
Amortization of net loss	0.1	0	0.2	0
Net periodic pension cost	$ 0.2	$ 0.2	$ 0.5	$ 0.4