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Borrowings and Credit Arrangements - Interest Expense under Convertible Notes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Debt Conversion [Line Items]
Non-cash interest expense	$ 68.7	$ 81.2	$ 75.0
Convertible Notes Payable [Member]
Debt Conversion [Line Items]
Amortization of debt discount	37.1	52.7	68.5
Amortization of deferred financing costs	1.9	3.0	3.8
Principal accretion	15.3	9.2	0
Non-cash interest expense	54.3	64.9	72.3
2.00% accrued interest	22.3	34.4	34.9
Interest expense, net	$ 76.6	$ 99.3	$ 107.2
Percentage of accrued interest on Convertible Notes	2.00%	2.00%

X

- Definition

The component of interest expense representing the periodic charge against earnings to reflect amortization of debt issuance costs over the life of the related debt instruments.

+ References

No definition available.

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- Definition

Represents the amount of principal accretion at the applicable rate pursuant to the terms of the debt agreement, which is recorded as interest expense.

+ References

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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