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Shareholders' Equity (Tables)
 12 Months Ended
May. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Stock by Class
The number of shares of common stock, par value $0.50 per share, authorized, issued and outstanding and in treasury, was as follows:
 
 
May 2, 2015
 
May 3, 2014
Authorized
100,000,000

 
100,000,000

Issued and outstanding
39,702,036

 
39,262,168

In treasury
1,346,624

 
1,342,188
Schedule of Expense Related to Equity Awards
The table below summarizes the expense related to the equity awards for fiscal 2015, 2014 and 2013.

 
Compensation Expense
 
Fiscal 2015
 
Fiscal 2014
 
Fiscal 2013
2014 Incentive Plan:
 
 
 
 
 
RSAs
$
0.5

 
$
—

 
$
—

Total 2014 Incentive Plan
$
0.5

 
$
—

 
$
—

 
 
 
 
 
 
2010 Stock Plan:
 
 
 
 
 
RSAs
$
1.5

 
$
1.5

 
$
1.5

RSUs
0.1

 
0.3

 
0.5

Stock options
1.2

 
0.8

 
0.5

Total 2010 Stock Plan
$
2.8

 
$
2.6

 
$
2.5

 
 
 
 
 
 
2007 Stock Plan:
 
 
 
 
 
RSAs
$
0.5

 
$
0.4

 
$
0.2

Stock options
0.5

 
0.3

 
0.6

Total 2007 Stock Plan
$
1.0

 
$
0.7

 
$
0.8

 
 
 
 
 
 
Total Compensation Expense
$
4.3

 
$
3.3

 
$
3.3
2010 Stock Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock Option Activity and Related Information for Stock Options Granted
The following tables summarize the stock option activity and related information for the stock options granted under the 2010 Stock Plan for fiscal 2015, 2014 and 2013:
 
 
Summary of Option Activity
 
 
Shares
 
Wtd. Avg. Exercise Price
Outstanding April 28, 2012
 
240,000

 
$
9.97

Awarded
 
120,000

 
8.64

Exercised
 
—

 
—

Cancelled
 
—

 
—

Outstanding April 27, 2013
 
360,000

 
9.53

Awarded
 
120,000

 
17.27

Exercised
 
(59,999
)
 
9.50

Cancelled
 
—

 
—

Outstanding May 3, 2014
 
420,001

 
11.74

Awarded
 
108,000

 
37.01

Exercised
 
(285,334
)
 
10.47

Cancelled
 
—

 
—

Outstanding May 2, 2015
 
242,667

 
$
24.49
Summary of Stock Option Activity and Related Information for Stock Options Granted, Options Outstanding and Exercisable
Options Outstanding
at May 2, 2015
Shares
 
Exercise Price
 
Avg. Remaining Life (Years)
5,333

 
10.70

 
6.3
40,000

 
8.64

 
7.3
89,334

 
17.27

 
8.3
108,000

 
37.01

 
9.3
242,667

 
$
24.49

 
 
Options Exercisable
at May 2, 2015
Shares
 
Exercise Price
 
Avg. Remaining Life (Years)
5,333

 
10.70

 
6.3
9,334

 
17.27

 
8.3
14,667

 
$
14.88

 
 
Schedule of Estimated Fair Value of Stock Options on Date of Grant, Assumptions
We estimated the fair value of these stock options on the date of grant using the Black-Scholes option-pricing model with the following assumptions:
 
2010 Stock Plan
 
Fiscal 2015
 
Fiscal 2014
 
Fiscal 2013
 
Awards
 
Awards
 
Awards
Average expected volatility
51.00
%
 
65.33
%
 
66.15
%
Average risk-free interest rate
1.00
%
 
0.65
%
 
0.39
%
Dividend yield
1.66
%
 
2.81
%
 
2.94
%
Expected life of options (in years)
4.12

 
7.61

 
7.18

Weighted-average grant-date fair value
$
14.99

 
$
8.39

 
$
4.13
Summary of Restricted Stock Awards and Restricted Stock Units Activity
The following table summarizes the RSA and RSU activity for fiscal 2015, 2014 and 2013 under the 2010 Stock Plan:
 
RSA Shares
 
RSU Shares
Unvested and unissued at April 28, 2012
700,000

 
180,000

Awarded
—

 
—

Vested
—

 
(60,000
)
Forfeited and Cancelled
—

 
—

Unvested and unissued at April 27, 2013
700,000

 
120,000

Awarded
—

 
—

Vested
—

 
(60,000
)
Forfeited and Cancelled
—

 
—

Unvested and unissued at May 3, 2014
700,000

 
60,000

Awarded
—

 
—

Vested
(633,333
)
 
(60,000
)
Forfeited and Cancelled
—

 
—

Unvested and unissued at May 2, 2015
66,667

 
—
Schedule of Restricted Stock Awards and Restricted Stock Units by Grant Year and Vesting Period
 
 
 
 
 
 
Weighted Average Value
 
Probable Unearned Compensation Expense at May 2, 2015
 
Target Unearned Compensation Expense at May 2, 2015
Grant Fiscal Year
 
Number of Shares Granted, less Forfeitures
 
Vesting Period
 
 
 
2012
 
100,000

 
One-third per year, beginning in fiscal 2015, performance based
 
$
8.10

 
$
0.1

 
$
0.1
2007 Stock Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock Option Activity and Related Information for Stock Options Granted
The following tables summarize the stock option activity and related information for the stock options granted under the 2007 Stock Plan as of May 2, 2015:
 
 
Summary of Option Activity
 
Shares
 
Wtd. Avg.
Exercise Price
Outstanding at April 28, 2012
738,000

 
5.79

 
 
 
 
Awarded
42,500

 
8.64

Exercised
(2,500
)
 
8.10

Cancelled
—

 
—

Outstanding at April 27, 2013
778,000

 
5.94

 
 
 
 
Awarded
42,500

 
17.27

Exercised
(648,141
)
 
5.60

Cancelled
—

 
—

Outstanding at May 3, 2014
172,359

 
10.02

 
 
 
 
Awarded
50,500

 
37.01

Exercised
(114,859
)
 
8.55

Cancelled
—

 
—

Outstanding at May 2, 2015
108,000

 
24.21
Summary of Stock Option Activity and Related Information for Stock Options Granted, Options Outstanding and Exercisable
Options Outstanding
at May 2, 2015
Shares
 
Exercise Price
 
Avg.
Remaining
Life (Years)
5,000

 
10.55

 
5.3
10,000

 
8.10

 
6.5
14,167

 
8.64

 
7.3
28,333

 
17.27

 
8.3
50,500

 
37.01

 
9.3
108,000

 
$
24.21

 
 
 
Options Exercisable
at May 2, 2015 
Shares
 
Exercise Price
 
Avg.
Remaining
Life (Years)
5,000

 
10.55

 
5.3
10,000

 
8.10

 
6.5
15,000

 
$
8.92

 
 
Schedule of Estimated Fair Value of Stock Options on Date of Grant, Assumptions
We estimated the fair value of these stock options on the date of grant using the Black-Scholes option-pricing model with the following assumptions:
 
Fiscal 2015
Awards
 
Fiscal 2014
Awards
 
Fiscal 2013
Awards
Average expected volatility
51.00
%
 
65.33
%
 
66.15
%
Average risk-free interest rate
1.00
%
 
0.65
%
 
0.39
%
Dividend yield
1.66
%
 
2.81
%
 
2.94
%
Expected life of options
4.12 years

 
7.61 years

 
7.18 years

Weighted-average grant-date fair value
$
14.99

 
$
8.39

 
$
4.13
Summary of Restricted Stock Awards and Restricted Stock Units Activity
The following table summarizes the RSA activity under the 2007 Stock Plan: 
 
Fiscal 2015
 
Fiscal 2014
 
Fiscal 2013
Unvested at beginning of fiscal year
—

 
—

 
—

Awarded
13,500

 
27,000

 
27,000

Vested
(13,500
)
 
(27,000
)
 
(27,000
)
Forfeited
—

 
—

 
—

Unvested at end of period
—

 
—

 
—
2000 and 2004 Stock Plans  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock Option Activity and Related Information for Stock Options Granted
The following tables summarize the stock option activity and related information for the stock options granted under the 2000 and 2004 Stock Plans for fiscal 2015, 2014 and 2013:
 
Options Outstanding
 
Exercisable Options
 
Shares
 
Wtd. Avg.
Exercise
Price
 
Shares
 
Wtd. Avg.
Exercise
Price
April 28, 2012
251,365

 
$
10.96

 
251,365

 
$
10.96

 
 
 
 
 
 
 
 
Granted
—

 
—

 
 

 
 

Exercised
(50,675
)
 
11.44

 
 

 
 

Cancelled
(128,105
)
 
10.50

 
 

 
 

April 27, 2013
72,585

 
11.44

 
72,585

 
11.44

 
 
 
 
 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(71,175
)
 
11.44

 
 
 
 
Cancelled
(1,410
)
 
11.44

 
 
 
 
May 3, 2014
—

 
$
—

 
—

 
$
—