Debt Narrative (Details)						3 Months Ended										6 Months Ended	3 Months Ended			1 Months Ended						0 Months Ended	3 Months Ended		3 Months Ended
	Mar. 30, 2013 USD ($)		Dec. 29, 2012 USD ($)		Jun. 30, 2007 USD ($)	Mar. 30, 2013 Senior Notes [Member] USD ($)	Mar. 31, 2012 Senior Notes [Member] USD ($)	Mar. 30, 2013 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)	Mar. 31, 2012 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)	Dec. 29, 2012 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)	Jun. 15, 2007 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)	May 03, 2012 Senior Notes [Member] 2.0% Interest Rate, Maturing 2017 [Member] USD ($)	May 03, 2012 Senior Notes [Member] 3.5% Interest Rate, Maturing 2022 [Member] USD ($)	May 03, 2012 Senior Notes [Member] 5.0% Interest Rate, Maturing 2042 [Member] USD ($)	Sep. 22, 2005 Senior Notes [Member] 5.0% Interest Rate, Maturing 2042 [Member]	Sep. 29, 2012 Line of Credit [Member]	Jun. 25, 2011 Line of Credit [Member] Revolving Multicurrency Bank Credit Facility [Member]	Mar. 30, 2013 Line of Credit [Member] Revolving Multicurrency Bank Credit Facility [Member] USD ($)	Mar. 31, 2012 Line of Credit [Member] Revolving Multicurrency Bank Credit Facility [Member] USD ($)	Sep. 29, 2012 Revolving Credit [Member]	Sep. 10, 2012 Revolving Credit [Member] EUR (€)	Apr. 03, 2012 Revolving Credit [Member] USD ($)	Apr. 03, 2012 Tranch 2 [Member] Term Loan Agreement [Member] EUR (€)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) USD ($)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) EUR (€)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] EUR (€)	Mar. 30, 2013 Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] USD ($)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) Senior Notes [Member] EUR (€)	Mar. 30, 2013 Equity conversion feature of debt Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] USD ($)	Mar. 30, 2013 Fair Value, Inputs, Level 3 [Member] USD ($)	Dec. 29, 2012 Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 30, 2013 Fair Value, Inputs, Level 3 [Member] Debt [Member] USD ($)	Jun. 15, 2012 Fair Value, Inputs, Level 3 [Member] Debt [Member] Molson Coors Central Europe (MCCE) USD ($)
Debt Instrument [Line Items]
Debt instrument, interest rate percentage								2.50%			2.50%	2.00%	3.50%	5.00%	5.00%												0.00%
Debt, principal amount, per share											$ 1,000
Debt, convertible conversion price per share								$ 52.18			$ 54.76
Percentage of premium over stock price of convertible debt											25.00%
Debt instrument, convertible number of equity instruments, ratio								19.1662			18.263
Interest expense, debt amortization						4,600,000	4,500,000
Interest expense, debt								3,600,000	3,700,000
Effective interest rate percentage								5.80%	5.90%
Unamortized debt discount								6,200,000		10,800,000
Debt instrument, face amount					575,000,000			575,000,000			575,000,000	300,000,000	500,000,000	1,100,000,000							150,000,000		120,000,000			500,000,000
Commercial paper, maximum borrowing capacity	950,000,000
Noncash interest expense due to amortization of unamortized debt discount in future periods convertible debt estimated range low								6,200,000
Business acquisition, cost of acquired entity, liabilities incurred																								3,400,000,000	2,700,000,000	500,000,000		500,000,000
Stock available upon conversion of convertible securities (shares)																								12,894,044	12,894,044
Derivative liabilities																																	15,200,000
Discounts to long-term debt																										1,300,000
Long-term debt	4,637,900,000		4,654,900,000																								(640,900,000)
Derivative financial instruments, liabilities, fair value disclosure																													(37,400,000)	37,400,000	7,900,000	37,400,000
Unrealized loss, change in fair value of debt convertion feature																													(29,500,000)
Convertible debt instrument, effective interest rate																											0.25%
Debt instrument, term																4 years	4 years			1 year
Revolving credit facility, maximum borrowing capacity																			400,000,000			550,000,000
Commercial paper outstanding, amount	0
Additional capacity for letters of credit																			100,000,000
Credit facility, current borrowing capacity	0	[1]	0	[1]														0
Short-term borrowings	13,300,000		13,200,000
Long-term debt, fair value	$ 4,945,200,000		$ 4,993,000,000

[1] (3)In the first quarter of 2013, a $950 million commercial paper program was approved and implemented. The commercial paper program is supported by our $550 million and $400 million revolving credit facilities. As of March 30, 2013, there were no outstanding borrowings under the commercial paper program.In the third quarter of 2012, we entered into a revolving credit agreement ("Euro Credit Agreement") to support our operations in Central Europe within our Europe segment. The Euro Credit Agreement provides for a 1-year revolving credit facility of €150 million on an uncommitted basis. In the second quarter of 2012, we entered into a revolving credit agreement (the ''Credit Agreement''). The Credit Agreement provides for a 4-year revolving credit facility of $550 million. The Credit Agreement contains customary events of default and specified representations and warranties and covenants, including, among other things, covenants that limit our subsidiaries' ability to incur certain additional priority indebtedness, create or permit liens on assets, or engage in mergers or consolidations. In the second quarter of 2011, we entered into an agreement for a 4-year revolving multicurrency credit facility of $400 million, which provides a $100 million sub-facility available for the issuance of letters of credit.There were no outstanding borrowings on any of our credit facilities as of March 30, 2013.