Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Apr. 01, 2016	Apr. 01, 2016	Apr. 03, 2015	Oct. 02, 2015
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ 98,876	$ 98,876		$ 74,340
Impairment charges	13,000	12,955	$ 3,500
Impairments charges, fixed assets, intangibles and contractual commitment	11,005	11,005
Inventory write off	2,000
Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Impairments charges, fixed assets, intangibles and contractual commitment	10,100
Fixed assets [Member]
Finite-Lived Intangible Assets [Line Items]
Impairments charges, fixed assets, intangibles and contractual commitment	600
Contractual Commitments [Member]
Finite-Lived Intangible Assets [Line Items]
Impairments charges, fixed assets, intangibles and contractual commitment	300
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	64,500	64,500	39,400
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ 34,400	$ 34,400	$ 12,800