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Commitments and Contingencies - Schedule of Product Warranty Liabilities and Balances Reported in Condensed Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 23, 2015	Jan. 24, 2014	Jan. 23, 2015	Jan. 24, 2014	Apr. 25, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 96.6us-gaap_StandardProductWarrantyAccrual	$ 116.0us-gaap_StandardProductWarrantyAccrual	$ 110.0us-gaap_StandardProductWarrantyAccrual	$ 117.2us-gaap_StandardProductWarrantyAccrual
Expense accrued during the period	3.1us-gaap_StandardProductWarrantyAccrualWarrantiesIssued	21.1us-gaap_StandardProductWarrantyAccrualWarrantiesIssued	21.9us-gaap_StandardProductWarrantyAccrualWarrantiesIssued	59.4us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Warranty costs incurred	(12.2)us-gaap_StandardProductWarrantyAccrualPayments	(20.0)us-gaap_StandardProductWarrantyAccrualPayments	(44.4)us-gaap_StandardProductWarrantyAccrualPayments	(59.5)us-gaap_StandardProductWarrantyAccrualPayments
Balance at end of period	87.5us-gaap_StandardProductWarrantyAccrual	117.1us-gaap_StandardProductWarrantyAccrual	87.5us-gaap_StandardProductWarrantyAccrual	117.1us-gaap_StandardProductWarrantyAccrual
Standard Product Warranty Accrual, Balance Sheet Classification [Abstract]
Other current liabilities	59.5us-gaap_StandardProductWarrantyAccrualCurrent		59.5us-gaap_StandardProductWarrantyAccrualCurrent		73.0us-gaap_StandardProductWarrantyAccrualCurrent
Other long-term liabilities	28.0us-gaap_StandardProductWarrantyAccrualNoncurrent		28.0us-gaap_StandardProductWarrantyAccrualNoncurrent		37.0us-gaap_StandardProductWarrantyAccrualNoncurrent
Total	$ 87.5us-gaap_StandardProductWarrantyAccrual	$ 117.1us-gaap_StandardProductWarrantyAccrual	$ 87.5us-gaap_StandardProductWarrantyAccrual	$ 117.1us-gaap_StandardProductWarrantyAccrual

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- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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Amount as of the balance sheet date of the aggregate standard product warranty liability that is expected to be paid within one year or the normal operating cycle, if longer. Does not include the balance for the extended product warranty liability.

+ References

No definition available.

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Amount as of the balance sheet date of the aggregate standard product warranty liability that is expected to be paid after one year or beyond the normal operating cycle, if longer. Does not include the balance for the extended product warranty liability.

+ References

No definition available.

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Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(2))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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- Definition

Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(3))

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