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Share-Based Payments (Narrative) (Details)
6 Months Ended
May 01, 2017
USD ($)
$ / shares
shares
Aug. 11, 2014
shares
Jun. 30, 2017
USD ($)
item
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share units reclassified to temporary equity     $ (382,000)
Stock Option Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs     $ 10,928,000
Unrecognized compensation costs, period for recognition     2 years 4 months 24 days
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value of options granted | $ / shares     $ 7.61
Number of plans | item     3
Stock Options Assumed [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average share price of options assumed | $ / shares     $ 16.93
Performance Share Units, Equity Classified Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs     $ 6,456,000
Unrecognized compensation costs, period for recognition     1 year 10 months 24 days
Units granted | shares     95,212
Performance Share Units, Liability Classified Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs     $ 4,667,000
Unrecognized compensation costs, period for recognition     2 years
Units granted | shares [1]     89,643
Performance Share Units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of units available for grant as a percentage of target     0.00%
Performance Share Units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of units available for grant as a percentage of target     200.00%
Performance Share Units [Member] | Sign-on Grant Performance Share Unit Plans [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining shares authorized for grant | shares 150,000    
Weighted average grant date fair value of options granted | $ / shares $ 24.47    
Units granted | shares   102,375  
Share unit liability $ 1,421,000    
Share units reclassified to temporary equity $ 1,803,000    
Performance Share Units [Member] | Sign-on Grant Performance Share Unit Plans [Member] | Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     2 years
Performance Share Units [Member] | Sign-on Grant Performance Share Unit Plans [Member] | Tranche Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     3 years
Performance Share Units [Member] | Sign-on Grant Performance Share Unit Plans [Member] | Tranche Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     4 years
Performance Share Units [Member] | Sign-on Grant Performance Share Unit Plans [Member] | Tranche Four [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     5 years
Restricted Share Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs     $ 83,000
Unrecognized compensation costs, period for recognition     1 year 1 month 6 days
Units granted | shares     801
Deferred Share Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs     $ 0
Units granted | shares     8,624
[1] Liability-classified PSUs include PSUs awarded under the employee PSU plan and the previous 2013 PSU plan, in place prior to 2015 that are cash-settled and not subject to market vesting conditions.