Commitments and Contingencies (Details Textual) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
	Oct. 31, 2011	Oct. 31, 2011	Jan. 31, 2010	Jan. 31, 2009	Jan. 31, 2008	Oct. 31, 2011 General and Administrative Expense [Member]	Oct. 31, 2010 General and Administrative Expense [Member]	Oct. 31, 2011 General and Administrative Expense [Member]	Oct. 31, 2010 General and Administrative Expense [Member]	Mar. 31, 2011 Laurelton Diamonds, Inc. [Member]	Oct. 31, 2011 Laurelton Diamonds, Inc. [Member]
Commitment and Contingencies (Textual)
Amount of term loan given										$ 50,000,000
Loans receivable, basis spread on variable rate											3.50%
Interest rate on loan (per annum)											LIBOR
Loans receivable, fixed rate											4.00%
Commitment and Contingencies Additional (Textual)
Lease exit charge		30,884,000						30,884,000
Actual expense incurred for New York headquarters relocation						$ 0	$ 6,421,000	$ 42,719,000	$ 11,226,000
Watches sold as a percentage of total sales	1.00%	1.00%	1.00%	1.00%	1.00%