Annual report pursuant to Section 13 and 15(d)

Description of Business, Basis of Presentation and Summary of Significant Accounting Policies (Details Textual)

v3.8.0.1
Description of Business, Basis of Presentation and Summary of Significant Accounting Policies (Details Textual)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Feb. 28, 2018
USD ($)
stock_based_compensation_plan
class_of_stock
$ / shares
Nov. 30, 2017
$ / shares
Aug. 31, 2017
$ / shares
May 31, 2017
$ / shares
Feb. 28, 2017
USD ($)
$ / shares
Nov. 30, 2016
$ / shares
Aug. 31, 2016
$ / shares
May 31, 2016
$ / shares
Feb. 28, 2018
USD ($)
stock_based_compensation_plan
class_of_stock
$ / shares
Feb. 28, 2017
USD ($)
$ / shares
Feb. 29, 2016
USD ($)
$ / shares
Mar. 01, 2018
USD ($)
Class of Stock [Line Items]                        
Number of classes of common stock with a material number of shares outstanding | class_of_stock 2               2      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Provision for income taxes                 $ 11.9 $ 554.2 $ 440.6  
Deferred tax assets adjustment $ 210.6       $ 231.7       210.6 231.7    
Advertising expense                 $ 615.7 $ 552.8 $ 468.3  
Number of stock-based employee compensation plans | stock_based_compensation_plan 2               2      
Class A Common Stock [Member]                        
Class of Stock [Line Items]                        
Common stock, dividend rights                 10.00%      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Net income per common share attributable to CBI – diluted | $ / shares $ 4.64 $ 2.44 $ 2.48 $ 2.00 $ 2.26 $ 1.98 $ 1.75 $ 1.55 $ 11.55 $ 7.52 $ 5.18  
Accounting Standards Update 2016-09, Stock-based employee compensation [Member]                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Provision for income taxes                 $ (68.6)      
Net income per common share attributable to CBI – diluted | $ / shares                 $ 0.07      
Accounting Standards Update 2014-09, Revenue recognition [Member] | Subsequent Event [Member]                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Opening retained earnings adjustment                       $ (50.0)
Accounting Standards Update 2016-16, Income taxes [Member] | Subsequent Event [Member]                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Opening retained earnings adjustment                       $ 2,200.0