Related Party Transactions (Details)	6 Months Ended
	Aug. 02, 2014 board_members	Jan. 02, 2011
Related Party Transaction [Line Items]
Current Fiscal Year End Date	--01-31
Comcast [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage in NBCU		51.00%
GE [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage in NBCU		49.00%
Common Stock Shares Held in Subsidiary	5,058,741
Number of Members Related Party Entitled to Appoint to Board of Directors	2
NBCU [Member]
Related Party Transaction [Line Items]
Common Stock Shares Held in Subsidiary	7,141,849
Minimum Beneficial Ownership to Retain Board Seat	5.00%