Shareholders' Equity - Allocated Compensation Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
May 03, 2014	Apr. 27, 2013	Apr. 28, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized equity-based compensation cost		$ 2.5
Weighted average period for recognition of unrecognized equity-based compensation cost	1 year 6 months 19 days
Compensation expense	3.3	3.3	4.0
2010 Stock Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	2.6	2.5	2.9
2010 Stock Plan \| RSAs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	1.5	1.5	1.4
2010 Stock Plan \| RSUs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	0.3	0.5	0.9
2010 Stock Plan \| Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	0.8	0.5	0.6
2007 Stock Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	0.7	0.8	1.1
2007 Stock Plan \| RSAs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	0.4	0.2	0.3
2007 Stock Plan \| Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense	$ 0.3	$ 0.6	$ 0.8

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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