Acquisitions - Components of Acquired Intangible Assets on a Preliminary Basis (Detail) $ in Thousands	6 Months Ended
	Apr. 01, 2016 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 88,796
FiBest Limited [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	45,650
Aeroflex/Metelics Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	19,700
BinOptics Corporation [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	137,300
Developed Technology [Member] \| FiBest Limited [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 9,400
Acquired intangible assets, Useful Lives	7 years
Developed Technology [Member] \| Aeroflex/Metelics Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 1,000
Acquired intangible assets, Useful Lives	7 years
Developed Technology [Member] \| BinOptics Corporation [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 17,500
Acquired intangible assets, Useful Lives	7 years
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 55,350
Customer Relationships [Member] \| FiBest Limited [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 36,250
Acquired intangible assets, Useful Lives	10 years
Customer Relationships [Member] \| Aeroflex/Metelics Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 18,700
Acquired intangible assets, Useful Lives	10 years
Customer Relationships [Member] \| BinOptics Corporation [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 119,800
Acquired intangible assets, Useful Lives	10 years