XML 63 R48.htm IDEA: XBRL DOCUMENT v3.10.0.1
Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 25, 2018
Mar. 30, 2018
Apr. 28, 2017
Mar. 29, 2017
Aug. 04, 2018
Jul. 29, 2017
Aug. 04, 2018
Jul. 29, 2017
Disclosure of share-based compensation information under stock plans                
Share-based compensation expense         $ 4,031 $ 4,187 $ 7,989 $ 8,150
Share-Based Compensation, Additional Disclosures                
Unrecognized compensation cost related to nonvested stock options         4,800   $ 4,800  
Weighted average fair values of stock options granted during the period (in dollars per share)             $ 5.89 $ 1.57
Granted (in shares)   431,371   1,283,175        
Employee Stock Purchase Plan                
Disclosure of share-based compensation information under stock plans                
Share-based compensation expense         67 43 $ 160 $ 79
Stock options                
Disclosure of share-based compensation information under stock plans                
Share-based compensation expense         $ 672 581 $ 1,367 1,190
Share-Based Compensation, Additional Disclosures                
Weighted average period for recognition of unrecognized compensation cost (in years/months/days)         1 year 8 months 10 days   1 year 8 months 10 days  
Stock awards or units                
Disclosure of share-based compensation information under stock plans                
Share-based compensation expense         $ 3,292 $ 3,563 $ 6,462 $ 6,881
Share-Based Compensation, Additional Disclosures                
Unrecognized compensation cost related to nonvested stock awards/units         $ 44,500   $ 44,500  
Weighted average period for recognition of unrecognized compensation cost (in years/months/days)         1 year 8 months 10 days   1 year 8 months 10 days  
Number of Units                
Granted (in shares)   490,528   707,675        
Performance-based or market-based units                
Number of Units                
Granted (in shares) 619,578.000   1,056,042          
Performance-based units                
Number of Units                
Nonvested at the beginning of the period (in shares)             1,300,921  
Granted (in shares)             489,646  
Vested (in shares)             (141,625)  
Forfeited (in shares)             (27,441)  
Nonvested at the end of the period (in shares)         1,621,501   1,621,501  
Weighted Average Grant Date Fair Value                
Nonvested at the beginning of the period (in dollars per share)             $ 14.01  
Granted (in dollars per share)             21.83  
Vested (in dollars per share)             15.07  
Forfeited (in dollars per share)             11.16  
Nonvested at the end of the period (in dollars per share)         $ 16.33   $ 16.33  
Performance units | Vesting, Tranche One                
Share-Based Compensation, Additional Disclosures                
Vesting period (in years)             1 year  
Performance units | Vesting, annual vesting periods after initial vesting period | Minimum                
Share-Based Compensation, Additional Disclosures                
Vesting period (in years)             2 years  
Performance units | Vesting, annual vesting periods after initial vesting period | Maximum                
Share-Based Compensation, Additional Disclosures                
Vesting period (in years)             3 years  
Target performance units                
Share-Based Compensation, Additional Disclosures                
Vesting period (in years)             3 years  
Target performance units | Minimum                
Share-Based Compensation, Additional Disclosures                
Vesting rights based on the satisfaction of certain performance or market-based criteria (as a percentage)             0.00%  
Target performance units | Maximum                
Share-Based Compensation, Additional Disclosures                
Vesting rights based on the satisfaction of certain performance or market-based criteria (as a percentage)             200.00%  
Market-based units                
Share-Based Compensation, Additional Disclosures                
Vesting period (in years)             3 years  
Period which award is subject to a market condition (in years)             3 years  
Number of Units                
Nonvested at the beginning of the period (in shares)             388,477  
Granted (in shares)             129,932  
Vested (in shares)             0  
Forfeited (in shares)             0  
Nonvested at the end of the period (in shares)         518,409   518,409  
Weighted Average Grant Date Fair Value                
Nonvested at the beginning of the period (in dollars per share)             $ 12.28  
Granted (in dollars per share)             20.28  
Vested (in dollars per share)             0.00  
Forfeited (in dollars per share)             0.00  
Nonvested at the end of the period (in dollars per share)         $ 14.28   $ 14.28  
Market-based units | Minimum                
Share-Based Compensation, Additional Disclosures                
Vesting rights based on the satisfaction of certain performance or market-based criteria (as a percentage)             0.00%  
Market-based units | Maximum                
Share-Based Compensation, Additional Disclosures                
Vesting rights based on the satisfaction of certain performance or market-based criteria (as a percentage)             150.00%