SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2015	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Accounting Policies [Abstract]
Anti-dilutive shares excluded from diluted net income per share calculation		165,000	160,000	364,000
Common stock issued in connection with exercise or vesting of equity awards		270,630	620,036	639,296
Treasury shares re-issued in connection with the exercise or vesting of equity awards	317,143
Stock split of common stock		two-for-one split
Advertising expense		$ 81,900	$ 71,500	$ 62,300
Prepaid advertising		7,200	5,800
Accounting Policies [Line Items]
Selling, general and administrative expenses		628,762	571,990	440,506
Wholesale shipping and handling costs
Accounting Policies [Line Items]
Selling, general and administrative expenses		73,100	62,400	54,800
Retail shipping and handling costs
Accounting Policies [Line Items]
Selling, general and administrative expenses		$ 9,900	$ 8,400	$ 3,100
Stock Options
Accounting Policies [Line Items]
Vesting period of awards		10 years
Minimum
Accounting Policies [Line Items]
Intangible assets, estimated useful lives		3 years
Minimum | Restricted Stock Units (RSUs)
Accounting Policies [Line Items]
Vesting period of awards		4 years
Maximum
Accounting Policies [Line Items]
Intangible assets, estimated useful lives		15 years
Maximum | Restricted Stock Units (RSUs)
Accounting Policies [Line Items]
Vesting period of awards		5 years