Statements of Cash Flows - Supplemental Cash Flows and Non Cash Investing and Financing Activities (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
Jan. 25, 2013	Jan. 27, 2012
Non-cash Investing and Financing Activities:
Reclassification of equity component of convertible debt	$ 62.6	$ 114.6
Acquisition of property and equipment outstanding in accounts payable	30.4	37.4
Acquisition of property and equipment through long-term financing	0.8	3.0
Vested options assumed in acquisition	1.2	0
Supplemental Cash Flow Information:
Income taxes paid, net of refunds	33.9	39.3
Interest paid, net of capitalized interest	$ 22.6	$ 21.3

The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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- Definition

The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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