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Restructuring and Divestiture Charges - Charges Taken Related to Restructuring Actions (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Sep. 27, 2014
Restructuring Cost and Reserve [Line Items]
Fiscal restructuring and divestiture charges	$ 8.0us-gaap_RestructuringCharges	$ 18.3us-gaap_RestructuringCharges
Restructuring \| Fiscal 2014 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			42.2
Non-cash impairment charge			3.1
Facility closure costs			0.6
Other			0.3
Fiscal restructuring charges			46.2
Divestiture net charges			5.5
Fiscal restructuring and divestiture charges			51.7
Restructuring \| Fiscal 2015 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions	7.3
Facility closure costs	0.7
Fiscal restructuring charges	8.0
Restructuring \| Consolidation of Diagnostics Operations \| Fiscal 2014 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			2.9
Non-cash impairment charge			0
Facility closure costs			0
Other			0.1
Fiscal restructuring charges			3.0
Restructuring \| Consolidation of Diagnostics Operations \| Fiscal 2015 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions	0.1
Facility closure costs	0.4
Fiscal restructuring charges	0.5
Restructuring \| Fiscal 2015 Actions \| Fiscal 2014 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			0
Non-cash impairment charge			0
Facility closure costs			0
Other			0
Fiscal restructuring charges			0
Restructuring \| Fiscal 2015 Actions \| Fiscal 2015 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions	2.5
Facility closure costs	0
Fiscal restructuring charges	2.5
Restructuring \| Fiscal 2014 Actions \| Fiscal 2014 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			29.5
Non-cash impairment charge			0
Facility closure costs			0
Other			0
Fiscal restructuring charges			29.5
Restructuring \| Fiscal 2014 Actions \| Fiscal 2015 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions	4.5
Facility closure costs	0.2
Fiscal restructuring charges	4.7
Restructuring \| Other Operating Cost Reductions \| Fiscal 2014 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			9.8
Non-cash impairment charge		3.1	3.1
Facility closure costs			0.6
Other			0.2
Fiscal restructuring charges			13.7
Restructuring \| Other Operating Cost Reductions \| Fiscal 2015 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions	0.2
Facility closure costs	0.1
Fiscal restructuring charges	$ 0.3

- Definition

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.

+ References+ Details

- Definition

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.

+ References+ Details