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Balance Sheet Details - Inventories (Detail) (USD $) In Millions, unless otherwise specified	Jan. 23, 2015	Apr. 25, 2014
Inventory Disclosure [Abstract]
Purchased components	$ 25.9us-gaap_InventoryRawMaterialsNetOfReserves	$ 17.6us-gaap_InventoryRawMaterialsNetOfReserves
Finished goods	91.9us-gaap_InventoryFinishedGoodsNetOfReserves	104.8us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories	$ 117.8us-gaap_InventoryNet	$ 122.4us-gaap_InventoryNet

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a)(1))

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-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.BB)

-URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 6

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Name Accounting Standards Codification

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-Section 35

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-URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312



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-Name Accounting Standards Codification

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-Section 45

-Paragraph 1

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

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-Section S99

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-Subparagraph (SAB TOPIC 5.BB)

-URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729



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-Name Regulation S-X (SX)

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-Paragraph 6

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

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