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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2007 | May. 02, 2015 | May. 03, 2014 | Apr. 27, 2013 | Apr. 28, 2012 | Apr. 30, 2011 | Jul. 15, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock - par value per share (in dollars per share) |  | $ 0.50 | $ 0.50 |  |  |  |
Dividends paid |  | $ 13.8 | $ 11.3 | $ 10.3 |  |  |
Compensation expense |  | 4.3 | 3.3 | 3.3 |  |  |
Unrecognized equity-based compensation cost |  | $ 1.5 |  |  |  |  |
Weighted average period for recognition of unrecognized equity-based compensation cost |  | 1 year 11 months 28 days |  |  |  |  |
2014 Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized for grant (in shares) |  |  |  |  |  |  | 3,000,000
Contingent reduction in number of shares authorized for grant (in shares) |  |  |  |  |  |  | 1
Number of shares available for grant (in shares) |  | 2,986,500 |  |  |  |  |
Compensation expense |  | $ 0.5 | 0.0 | 0.0 |  |  |
2014 Incentive Plan | RSAs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares issued (in shares) |  | 13,500 |  |  |  |  |
Compensation expense |  | $ 0.5 | $ 0.0 | $ 0.0 |  |  |
2010 Stock Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized for grant (in shares) |  | 2,000,000 |  |  |  |  |
Awarded options to purchase number of shares (in shares) |  | 108,000 | 120,000 | 120,000 |  |  |
Compensation expense |  | $ 2.8 | $ 2.6 | $ 2.5 |  |  |
2010 Stock Plan | RSAs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage |  |  |  |  | 33.30% |  |
Awarded shares (in shares) |  | 0 | 0 | 0 | 100,000 | 640,000 |
Historic multiple of EBITDA, used to calculate internal enterprise value for determining size of awards |  |  |  |  | 7.5 | 7.5 |
Compensation expense |  | $ 1.5 | $ 1.5 | $ 1.5 |  |  |
2010 Stock Plan | Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Awarded options to purchase number of shares (in shares) |  | 108,000 | 120,000 | 120,000 |  |  |
Award term |  | 10 years |  |  |  |  |
Annual vesting percentage |  | 33.30% |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |  |
Intrinsic value of outstanding options |  | $ 4.6 |  |  |  |  |
Compensation expense |  | $ 1.2 | $ 0.8 | $ 0.5 |  |  |
2010 Stock Plan | RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual vesting percentage |  |  |  |  |  | 20.00% |
Awarded shares (in shares) |  | 0 | 0 | 0 |  | 320,000 |
Award vesting percentage |  |  |  |  |  | 100.00% |
Compensation expense |  | $ 0.1 | $ 0.3 | $ 0.5 |  |  |
2010 Stock Plan | Bonus in Lieu of Dividends |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restriction period for awards |  | 5 years |  |  |  |  |
2010 Stock Plan | Tandem Cash Award |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum percentage of RSA award that could be the value of Tandem Cash Award |  | 40.00% |  |  |  |  |
Compensation expense |  | $ 5.6 | 3.9 | 2.1 |  |  |
2007 Stock Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized for grant (in shares) |  | 1,250,000 |  |  |  |  |
Compensation expense |  | $ 1.0 | $ 0.7 | $ 0.8 |  |  |
Total number of shares with respect to which awards may granted to any participant in any calendar year |  | 200,000 |  |  |  |  |
2007 Stock Plan | RSAs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares issued (in shares) |  | 13,500 | 27,000 | 27,000 |  |  |
Awarded shares (in shares) |  | 13,500 | 27,000 | 27,000 |  |  |
Compensation expense |  | $ 0.5 | $ 0.4 | $ 0.2 |  |  |
Number of shares converted from RSAs to RSUs outstanding (in shares) |  |  |  | 0 |  |  |
2007 Stock Plan | Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Awarded options to purchase number of shares (in shares) |  | 50,500 | 42,500 | 42,500 |  |  |
Award term |  | 10 years |  |  |  |  |
Annual vesting percentage |  | 33.30% |  |  |  |  |
Intrinsic value of outstanding options |  | $ 2.1 |  |  |  |  |
Compensation expense |  | $ 0.5 | $ 0.3 | $ 0.6 |  |  |
2007 Stock Plan | RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares converted from RSAs to RSUs outstanding (in shares) |  | 212,325 |  |  |  |  |
Number of day after termination that awards will be issued and delivered | 30 days |  |  |  |  |  |
Converted RSUs delivered (in shares) |  | 12,675 |  |  |  |  |
2007 Stock Plan | Converted from RSAs to RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares converted from RSAs to RSUs outstanding (in shares) | 225,000 |  |  |  |  |  |
2000 and 2004 Stock Plans | Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Awarded options to purchase number of shares (in shares) |  |  | 0 | 0 |  |  |
Number of shares granted in previous years that are currently outstanding and exercisable (in shares) |  | 0 |  |  |  |  |
Number of options expired during the period (in shares) |  |  | 1,410 | 128,105 |  |  |

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