Segment Information Revenue from External Customers by Products and Services (Details) (USD $)	3 Months Ended											12 Months Ended
	Jan. 31, 2015	Oct. 31, 2014		Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014		Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013		Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Revenue from External Customer [Line Items]
Net sales	$ 1,285,262,000	$ 959,589,000	[1]	$ 992,930,000	$ 1,012,132,000	$ 1,298,284,000	[2]	$ 911,478,000	$ 925,884,000	$ 895,484,000	[3]	$ 4,249,913,000	$ 4,031,130,000	$ 3,794,249,000
Statement, fine and solitare jewelry [Member]
Revenue from External Customer [Line Items]
Net sales												930,155,000	916,804,000	749,097,000
Engagement jewelry and wedding bands [Member]
Revenue from External Customer [Line Items]
Net sales												1,245,101,000	1,182,226,000	1,132,757,000
Fashion jewelry [Member]
Revenue from External Customer [Line Items]
Net sales												1,755,233,000	1,618,194,000	1,581,648,000
Other products/services [Member]
Revenue from External Customer [Line Items]
Net sales												$ 319,424,000	$ 313,906,000	$ 330,747,000

[1] a On a pre-tax basis, includes a charge of $93,779,000 for the quarter ended October 31, which reduced net earnings per diluted share by $0.47, associated with the redemption of $400,000,000 in aggregate principal amount of the Private Placement Notes prior to their scheduled maturities (see "Note G - Debt").

[2] b On a pre-tax basis, includes charges of $480,211,000 for the quarter ended January 31, related to the adverse arbitration ruling between The Swatch Group Ltd. and the Company (see "Note J - Commitments and Contingencies") and pre-tax income of $7,489,000 associated with foreign currency transaction gains on this expense. This reduced net earnings per diluted share by $2.27 when using weighted-average diluted shares of 129,283,000, which include 1,091,000 of incremental shares based upon the assumed exercise of stock options and unvested restricted stock units.

[3] a On a pre-tax basis, includes charges of $9,379,000 for the quarter ended April 30, which reduced net earnings per diluted share by $0.05, associated with severance related to staffing reductions and subleasing of certain office space for which only a portion of the Company's future rent obligations will be recovered (see "Note J - Commitments and Contingencies").