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Shareholders' Equity - RSA and RSU Activity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |
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May 03, 2014 | Apr. 27, 2013 | Apr. 28, 2012 | May 03, 2014 2010 Stock Plan | Apr. 27, 2013 2010 Stock Plan | Apr. 28, 2012 2010 Stock Plan | May 03, 2014 2010 Stock Plan RSAs | Apr. 27, 2013 2010 Stock Plan RSAs | Apr. 28, 2012 2010 Stock Plan RSAs | Apr. 27, 2013 2010 Stock Plan RSAs Cliff vesting | Apr. 30, 2011 2010 Stock Plan RSAs Cliff vesting | May 03, 2014 2010 Stock Plan RSAs Cliff vesting | May 03, 2014 2010 Stock Plan RSAs Cliff vesting Target | Apr. 27, 2013 2010 Stock Plan Bonus in Lieu of Dividends | May 03, 2014 2010 Stock Plan Tandem Cash Award | Apr. 27, 2013 2010 Stock Plan Tandem Cash Award | May 03, 2014 2010 Stock Plan RSUs | Apr. 27, 2013 2010 Stock Plan RSUs | Apr. 28, 2012 2010 Stock Plan RSUs | Apr. 27, 2013 2010 Stock Plan RSUs Equal annual installments | Apr. 30, 2011 2010 Stock Plan RSUs Equal annual installments | May 03, 2014 2010 Stock Plan RSUs Equal annual installments | Apr. 27, 2013 2010 Stock Plan RSAs and RSUs One-third per year, beginning in FY 2015, performance based | Apr. 28, 2012 2010 Stock Plan RSAs and RSUs One-third per year, beginning in FY 2015, performance based | May 03, 2014 2010 Stock Plan RSAs and RSUs One-third per year, beginning in FY 2015, performance based | May 03, 2014 2010 Stock Plan RSAs and RSUs One-third per year, beginning in FY 2015, performance based Target | May 03, 2014 2007 Stock Plan | Apr. 27, 2013 2007 Stock Plan | Apr. 28, 2012 2007 Stock Plan | May 03, 2014 2007 Stock Plan RSAs | Apr. 27, 2013 2007 Stock Plan RSAs | Apr. 28, 2012 2007 Stock Plan RSAs | Apr. 30, 2007 2007 Stock Plan RSUs | May 03, 2014 2007 Stock Plan RSUs | Apr. 30, 2007 2007 Stock Plan Converted from RSAs to RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual vesting percentage |  |  |  |  |  |  |  |  | 33.30% |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.30% |  |  |  |  |  |  |  |  |  |  |  |
Historic multiple of EBITDA, used to calculate internal enterprise value for determining size of awards |  |  |  |  |  |  |  |  | 7.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restriction period for awards |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of RSA award that could be the value of Tandem Cash Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense | $ 3.3 | $ 3.3 | $ 4.0 | $ 2.6 | $ 2.5 | $ 2.9 | $ 1.5 | $ 1.5 | $ 1.4 |  |  |  |  |  | $ 3.9 | $ 2.1 | $ 0.3 | $ 0.5 | $ 0.9 |  |  |  |  |  |  |  | $ 0.7 | $ 0.8 | $ 1.1 | $ 0.4 | $ 0.2 | $ 0.3 |  |  |
Number of shares converted from RSAs to RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 225,000
Number of day after termination that awards will be issued and delivered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |
Number of shares that have been delivered to date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,000 | 27,000 | 28,860 |  | 0 |
Award vesting period |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested and unissued - beginning balance (in shares) |  |  |  |  |  |  | 700,000 | 700,000 | 640,000 |  |  |  |  |  |  |  | 120,000 | 180,000 | 256,000 |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |
Awarded (in shares) |  |  |  |  |  |  | 0 | 0 | 100,000 |  | 600,000 |  |  |  |  |  | 0 | 0 | 0 |  | 300,000 |  |  | 100,000 |  |  |  |  |  | 27,000 | 27,000 | 28,860 |  |  |
Vested (in shares) |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  | (60,000) | (60,000) | (60,000) |  |  |  |  |  |  |  |  |  |  | (27,000) | (27,000) | (28,860) |  |  |
Forfeited and cancelled (in shares) |  |  |  |  |  |  | 0 | 0 | (40,000) |  |  |  |  |  |  |  | 0 | 0 | (16,000) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |
Unvested and unissued - ending balance (in shares) |  |  |  |  |  |  | 700,000 | 700,000 | 700,000 |  |  |  |  |  |  |  | 60,000 | 120,000 | 180,000 |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |
Weighted average value (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 9.70 |  |  |  |  |  |  |  |  |  | $ 9.70 |  |  | $ 8.10 |  |  |  |  |  |  |  |  |  |  |
Probable unearned compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 1.3 | $ 1.3 |  |  |  |  |  |  |  |  | $ 0.1 |  |  | $ 0.3 | $ 0.3 |  |  |  |  |  |  |  |  |

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- Definition 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. + References 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 + Details
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- Definition Market valuation of entity divided by earnings before interest, taxes, depreciation, and amortization (EBITDA), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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