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Shareholders' Equity: (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 6 Months Ended
Apr. 30, 2014
Feb. 04, 2014
Jan. 29, 2014
Jun. 28, 2014
Common Stock, Repurchase Program [Member]
Dividends        
Cash dividend approved by Board of Directors (in dollars per share) $ 0.06   $ 0.05  
Special cash dividend approved by Board of Directors (in dollars per share)   $ 5.00    
Total special dividend in cash   $ 25.8    
Borrowings on line of credit for special dividend   13.0    
Repurchase of Common Stock        
Number of shares repurchased       101,162
Aggregate purchase price of shares repurchased (in dollars)       $ 7.2
Aggregate purchase price per share of shares repurchased (in dollars per share)       $ 71.04
Number of additional shares that can be repurchased       231,568