Schedule of Carrying Value of Goodwill by Reporting Unit (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jul. 01, 2012	Dec. 25, 2011
Goodwill [Line Items]
Goodwill, Gross	$ 372.6	$ 372.6
Accumulated Impairment Losses	(203.3)	(203.3)
Goodwill, Net	169.3	169.3
MCCC
Goodwill [Line Items]
Goodwill reallocation	(3.0)
Goodwill, Gross	162.0	165.0
Accumulated Impairment Losses	0	0
Goodwill, Net	162.0	165.0
PCIA
Goodwill [Line Items]
Goodwill reallocation	3.0
Goodwill, Gross	156.1	153.1
Accumulated Impairment Losses	(148.8)	(148.8)
Goodwill, Net	7.3	4.3
SDT
Goodwill [Line Items]
Goodwill, Gross	54.5	54.5
Accumulated Impairment Losses	$ (54.5)	$ (54.5)

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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