Commitments and Contingencies (Details) (USD $) In Millions	6 Months Ended
	Jul. 31, 2011
Advertising 2011 [Member]
Commitments and Contingencies (Textuals) [Abstract]
Advertisement obligation	$ 27.1
Advertising 2012 [Member]
Commitments and Contingencies (Textuals) [Abstract]
Advertisement obligation	$ 21.0