XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Basis of Presentation (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 28, 2017 | Jan. 23, 2016 | Apr. 29, 2017 | Apr. 30, 2016
Basis of Presentation |  |  |  |
Length of fiscal year |  |  | 364 days | 371 days
Improvement in gross margin due to legal settlement (as a percent) | 0.20% | 0.30% |  |

X
- Definition Represents the percentage improvement in gross margin resulting from a legal settlement. + References No definition available. + Details
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X
- Definition Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. + 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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