Accumulated Other Comprehensive Loss and Reclassifications Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Jul. 30, 2016	Aug. 01, 2015	Apr. 30, 2016
Accumulated other comprehensive loss
Balance, net of $134 of taxes, as of April 30, 2016	$ (201)
Unrealized gains, net of $12 of taxes	18
Other comprehensive income, tax	122		$ 134
Balance, net of $122 or taxes, as of July 30, 2016	(183)		(201)
Unrealized gain, tax portion	12	$ 1
Available-for-sale securities.
Accumulated other comprehensive loss
Balance, net of $134 of taxes, as of April 30, 2016	(201)
Unrealized gains, net of $12 of taxes	18
Balance, net of $122 or taxes, as of July 30, 2016	$ (183)		$ (201)

Amount net of taxes of other comprehensive income (loss) unrealized.

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

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- Definition

Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569643-111683

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- Definition

Amount of tax expense (benefit) allocated to other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580

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-URI http://asc.fasb.org/extlink&oid=65896914&loc=d3e39076-109324

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