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Fair Value Measurements - Schedule of Estimated Fair Value of Assets Measured on a Nonrecurring Basis (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended
	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Sep. 29, 2012	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value			$ 1.4	$ 0		$ 1.4	$ 0
Intangible asset, Total Losses	(27.1)
Total Losses		(3.1)				(5.0)	(6.5)
Cost-method equity investments			1.5			1.5
Cost-method equity investments, Total Losses					(6.9)	(6.4)	0
Total Losses						(1,128.8)	(12.3)
Goodwill Fair Value Disclosure Non Recurring Measurement Remaining Value			277.8	0		277.8	0
Goodwill, Impairment Loss			(1,100.0)	(5.8)	0	(1,117.4)	(5.8)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value			1.4	0		1.4	0
Cost-method equity investments			1.5			1.5
Goodwill Fair Value Disclosure Non Recurring Measurement Remaining Value			277.8	0		277.8	0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Intangible assets					36.2
Intangible asset, Total Losses					(32.2)
Cost-method equity investments					0.8
Cost-method equity investments, Total Losses					(6.9)
Total Losses					(43.7)
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Intangible assets					0
Cost-method equity investments			0		0	0
Goodwill Fair Value Disclosure Non Recurring Measurement Remaining Value			0	0		0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Intangible assets					0
Cost-method equity investments			0		0	0
Goodwill Fair Value Disclosure Non Recurring Measurement Remaining Value			0	0		0	0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Intangible assets					36.2
Cost-method equity investments					0.8
Fair Value, Measurements, Nonrecurring [Member] | Property, Plant and Equipment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value					1.0
Total Losses					(1.5)
Fair Value, Measurements, Nonrecurring [Member] | Property, Plant and Equipment [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value			0	0	0	0	0
Fair Value, Measurements, Nonrecurring [Member] | Property, Plant and Equipment [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value			0	0	0	0	0
Fair Value, Measurements, Nonrecurring [Member] | Property, Plant and Equipment [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value					1.0
Fair Value, Measurements, Nonrecurring [Member] | Buildings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value					1.4
Total Losses					(3.1)
Fair Value, Measurements, Nonrecurring [Member] | Buildings [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value					0
Fair Value, Measurements, Nonrecurring [Member] | Buildings [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value					0
Fair Value, Measurements, Nonrecurring [Member] | Buildings [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value					$ 1.4

X

- Definition

This item represents the total amount of realized and unrealized losses for the period recorded in the statement of income from the measurement of assets on a non-recurring basis.

+ References

No definition available.

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- Definition

Represents the remaining carrying value of goodwill after performing the Step 2 analysis and recording an impairment charge for goodwill for a reporting unit whose fair value was less than its carrying value.

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Fair value portion of investments accounted under the cost method.

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- Definition

Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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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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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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