Identifiable Intangible Assets and their Estimated Useful Lives (Detail) (Zarlink Semiconductor, Inc, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jan. 01, 2012 Year
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 210,100
Completed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	47,800
Weighted Average Useful Life (in year)	6
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	144,600
Weighted Average Useful Life (in year)	6
Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	15,700
Weighted Average Useful Life (in year)	1
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 2,000
Weighted Average Useful Life (in year)	2