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Restructuring and Divestiture Charges - Charges Taken Related to Restructuring Actions (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 30, 2013	Sep. 29, 2012 Fiscal 2012 Charges [Member] Restructuring [Member]	Sep. 28, 2013 Fiscal 2013 Charges [Member] Restructuring [Member]	Mar. 29, 2014 Fiscal 2014 Charges [Member] Restructuring [Member]	Sep. 29, 2012 Consolidation of Diagnostics Operations [Member] Fiscal 2012 Charges [Member] Restructuring [Member]	Sep. 28, 2013 Consolidation of Diagnostics Operations [Member] Fiscal 2013 Charges [Member] Restructuring [Member]	Mar. 29, 2014 Consolidation of Diagnostics Operations [Member] Fiscal 2014 Charges [Member] Restructuring [Member]	Sep. 29, 2012 Closure of Indianapolis Facility [Member] Fiscal 2012 Charges [Member] Restructuring [Member]	Sep. 28, 2013 Closure of Indianapolis Facility [Member] Fiscal 2013 Charges [Member] Restructuring [Member]	Mar. 29, 2014 Closure of Indianapolis Facility [Member] Fiscal 2014 Charges [Member] Restructuring [Member]	Sep. 29, 2012 Fiscal 2014 Actions [Member] Fiscal 2012 Charges [Member] Restructuring [Member]	Sep. 28, 2013 Fiscal 2014 Actions [Member] Fiscal 2013 Charges [Member] Restructuring [Member]	Mar. 29, 2014 Fiscal 2014 Actions [Member] Fiscal 2014 Charges [Member] Restructuring [Member]	Sep. 29, 2012 Fiscal 2013 Actions [Member] Fiscal 2012 Charges [Member] Restructuring [Member]	Sep. 28, 2013 Fiscal 2013 Actions [Member] Fiscal 2013 Charges [Member] Restructuring [Member]	Mar. 29, 2014 Fiscal 2013 Actions [Member] Fiscal 2014 Charges [Member] Restructuring [Member]	Sep. 29, 2012 Other Operating Cost Reductions [Member] Fiscal 2012 Charges [Member] Restructuring [Member]	Sep. 28, 2013 Other Operating Cost Reductions [Member] Fiscal 2013 Charges [Member] Restructuring [Member]	Mar. 29, 2014 Other Operating Cost Reductions [Member] Fiscal 2014 Charges [Member] Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reductions					$ 15,249	$ 31,214	$ 25,983	$ 14,202	$ 13,950	$ 1,671	$ 879	$ 4,805	$ 238			$ 15,948		$ 11,332	$ 932	$ 168	$ 1,127	$ 7,194
Non-cash impairment charge			33,308	47	585	54	3,132	585													54	3,132
Purchase orders and other contractual obligations					351															351
Facility closure costs					430	550	445					173	445							430	377
Other					900	929	128				900	651						42			236	128
Fiscal restructuring charges					17,515	32,693	29,688	14,787	13,950	1,671	1,779	5,629	683			15,948		11,374	932	949	1,740	10,454
Divestiture net charges						112	221
Fiscal restructuring and divestiture charges	$ 11,559	$ 12,462	$ 29,909	$ 16,395	$ 17,515	$ 32,805	$ 29,909	$ 14,787			$ 1,779									$ 949

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Represents charges incurred to close or restructure a facility in connection with an exit or disposal activity. Such costs include clean-up costs and lease obligations. Costs are recorded as the activities are incurred except for lease obligation charges, which are recorded upon termination of the lease obligation or at the cease use date.

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Charges in the period for purchase orders and other contractual obligations related to exit or disposal activities that the Company is required to pay.

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Represents severance and related benefit charges for the termination of employees under an exit or disposal activity. Charges are recorded either as one-time termination benefits, which are recognized ratable over the required service period to receive such benefit, or under an ongoing benefit plan arrangement once the charge is probable and reasonably estimable.

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Total restructuring charges under exit or disposal plan.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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