Goodwill And Intangible Assets (Schedule Of Carrying Value Of Goodwill) (Details) (USD $) In Millions	3 Months Ended	12 Months Ended
Sep. 25, 2011	Mar. 27, 2011	Dec. 26, 2010
Goodwill, Gross	$ 372.6		$ 368.1
Accumulated Impairment Losses	(203.3)		(203.3)
Goodwill, Net	169.3		164.8
TranSiC acquisition		4.3	4.3
Other tax acquisition adjustment	(0.1)	0.3	0.2
MCCC [Member]
Goodwill, Gross	165.0		164.8
Accumulated Impairment Losses	0
Goodwill, Net	165.0		164.8
Other tax acquisition adjustment			0.2
PCIA [Member]
Goodwill, Gross	153.1		148.8
Accumulated Impairment Losses	(148.8)		(148.8)
Goodwill, Net	4.3
TranSiC acquisition			4.3
SDT [Member]
Goodwill, Gross	54.5		54.5
Accumulated Impairment Losses	(54.5)		(54.5)
Goodwill, Net	$ 0

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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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

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-Name Statement of Financial Accounting Standard (FAS)

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-Name Statement of Financial Accounting Standard (FAS)

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-Number 142

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-Name Statement of Financial Accounting Standard (FAS)

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