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Intangible Assets and Goodwill - Narrative - Intangible Assets (Details) - USD ($) $ in Millions | May 02, 2015 | May 01, 2015 | Apr. 30, 2016
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Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Change in remaining useful lives of some of the patents | 4 years | 12 years |
Trade names not subject to amortization | $ 1.8 |  | $ 1.8

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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Balance Type: | debit
Period Type: | instant