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Balance Sheet Details - Product Warranty Liabilities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 24, 2015	Apr. 25, 2014
Movement In Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of year	$ 110.0us-gaap_StandardProductWarrantyAccrual	$ 117.2us-gaap_StandardProductWarrantyAccrual
Expense accrued during the year	35.2us-gaap_StandardProductWarrantyAccrualWarrantiesIssued	70.2us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Warranty costs incurred	(59.5)us-gaap_StandardProductWarrantyAccrualPayments	(77.4)us-gaap_StandardProductWarrantyAccrualPayments
Balance at end of year	85.7us-gaap_StandardProductWarrantyAccrual	110.0us-gaap_StandardProductWarrantyAccrual
Standard Product Warranty Accrual, Balance Sheet Classification [Abstract]
Accrued expenses	57.8us-gaap_StandardProductWarrantyAccrualCurrent	73.0us-gaap_StandardProductWarrantyAccrualCurrent
Other long-term liabilities	27.9us-gaap_StandardProductWarrantyAccrualNoncurrent	37.0us-gaap_StandardProductWarrantyAccrualNoncurrent
Total warranty liabilities	$ 85.7us-gaap_StandardProductWarrantyAccrual	$ 110.0us-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=51674963&loc=d3e12565-110249

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- Definition

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.

+ Details

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- Definition

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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- Definition

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=51674963&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))

-URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249

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