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Shareholders' Equity - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 30, 2007
Apr. 30, 2016
May 02, 2015
May 03, 2014
Apr. 27, 2013
Apr. 28, 2012
Apr. 30, 2011
Sep. 30, 2015
May 01, 2015
Jul. 15, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock repurchase program, authorized amount               $ 100,000,000    
Purchase of common stock (in shares)   1,997,298                
Purchase of common stock   $ 62,300,000 $ 0 $ 0            
Common stock - par value per share (in dollars per share)   $ 0.50 $ 0.50              
Dividends paid   $ 13,500,000 $ 13,800,000 11,300,000            
Share price                 $ 43.59  
Compensation expense   7,400,000 4,300,000 3,300,000            
Unrecognized equity-based compensation cost   $ 37,900,000                
Weighted average period for recognition of unrecognized equity-based compensation cost   3 years 11 months 18 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)   1,225,500                
Compensation expense   $ 6,400,000 $ 500,000 0            
2014 Incentive Plan | RSAs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awarded shares (in shares)   1,185,000 13,500              
Vested (in shares)   24,000 13,500              
Compensation expense   $ 3,600,000 $ 500,000 0            
2014 Incentive Plan | RSAs | Five-year RSA cliff, performance-based                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period   5 years                
Awarded shares (in shares)   774,000                
Unearned compensation expense   $ 21,900,000                
2014 Incentive Plan | RSAs | Executives and non-executive members of management                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awarded shares (in shares)   1,161,000                
2014 Incentive Plan | RSAs | Independent directors                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares issued (in shares)   24,000 13,500              
Compensation expense   $ 800,000 $ 1,000,000              
2014 Incentive Plan | RSUs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awarded shares (in shares)   576,000 0              
Vested (in shares)   0 0              
Unearned compensation expense                   $ 18,400,000
Compensation expense   $ 2,800,000 $ 0 $ 0            
2014 Incentive Plan | RSUs | Five-year RSU, 30% in fiscal 2018, 30% in fiscal 2019 and 40% in fiscal 2020                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period   5 years                
Awarded shares (in shares)   576,000                
Unearned compensation expense   $ 15,600,000                
2014 Incentive Plan | RSUs | Five-year RSU, 30% in fiscal 2018                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage   30.00%                
2014 Incentive Plan | RSUs | Five-year RSU, 30% in fiscal 2019                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage   30.00%                
2014 Incentive Plan | RSUs | Five-year RSU, 40% in fiscal 2020                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting percentage   40.00%                
2014 Incentive Plan, 2020 EBITDA Less Than Threshold | RSAs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vested (in shares)   0                
2014 Incentive Plan, 2020 EBITDA Threshold | RSAs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
2020 EBITDA goal   $ 198,900,000                
2014 Incentive Plan, 2020 EBITDA Target | RSAs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awarded shares (in shares)   774,000                
2020 EBITDA goal   $ 221,000,000                
Unearned compensation expense                   $ 24,800,000
Compensation expense   $ 2,800,000                
2014 Incentive Plan, 2020 EBITDA Maximum | RSAs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awarded shares (in shares)   387,000                
2020 EBITDA goal   $ 243,100,000                
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   $ 400,000 $ 2,800,000 $ 2,600,000            
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      
Vested (in shares)   33,333 633,333 0            
Historic multiple of EBITDA, used to calculate internal enterprise value for determining size of awards           7.5 7.5      
Compensation expense   $ 0 $ 1,500,000 $ 1,500,000            
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)   0 108,000 120,000            
Award term   10 years                
Annual vesting percentage   33.30%                
Award vesting period   3 years                
Intrinsic value of outstanding options   $ 1,700,000                
Compensation expense   $ 300,000 $ 1,200,000 $ 800,000            
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      
Vested (in shares)   0 60,000 60,000            
Award vesting percentage             100.00%      
Compensation expense   $ 100,000 $ 100,000 $ 300,000            
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     5,600,000 3,900,000            
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   $ 600,000 $ 1,000,000 $ 700,000            
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            
Awarded shares (in shares)   0 13,500 27,000            
Vested (in shares)   0 13,500 27,000            
Compensation expense   $ 0 $ 500,000 $ 400,000            
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)   0 50,500 42,500 42,500          
Award term   10 years                
Annual vesting percentage   33.30%                
Intrinsic value of outstanding options   $ 400,000                
Compensation expense   $ 600,000 $ 500,000 $ 300,000            
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)   207,672                
Number of day after termination that awards will be issued and delivered 30 days                  
Converted RSUs delivered (in shares)   17,328                
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