Segments - Information regarding reportable segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jul. 31, 2014		Jul. 31, 2013		Jul. 31, 2014		Jul. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 424,010		$ 304,158		$ 790,202		$ 576,773
Cost of goods sold	275,951		204,739		511,966		384,961
Gross profit	148,059		99,419		278,236		191,812
Selling, general and administrative	131,609		89,044		254,050		174,872
Depreciation and amortization	4,955		3,242		9,181		6,363
Operating profit (loss)	11,495		7,133		15,005		10,577
Operating Segments | Licensed
Segment Reporting Information [Line Items]
Net sales	253,930		202,454		470,645		382,961
Cost of goods sold	184,541		147,689		340,332		277,991
Gross profit	69,389		54,765		130,313		104,970
Selling, general and administrative	55,049		48,495		104,528		94,752
Depreciation and amortization	1,169		575		2,023		1,060
Operating profit (loss)	13,171		5,695		23,762		9,158
Operating Segments | Non-Licensed
Segment Reporting Information [Line Items]
Net sales	87,276		70,400		155,025		131,089
Cost of goods sold	54,278		45,887		97,739		87,382
Gross profit	32,998		24,513		57,286		43,707
Selling, general and administrative	24,173		19,964		45,392		39,262
Depreciation and amortization	2,145		1,875		4,123		3,814
Operating profit (loss)	6,680		2,674		7,771		631
Operating Segments | Retail
Segment Reporting Information [Line Items]
Net sales	100,053		41,097		195,686		86,347
Cost of goods sold	54,381		20,950		105,049		43,160
Gross profit	45,672		20,147		90,637		43,187
Selling, general and administrative	52,387		20,621		104,130		40,956
Depreciation and amortization	1,641		792		3,035		1,489
Operating profit (loss)	(8,356)		(1,266)		(16,528)		742
Elimination
Segment Reporting Information [Line Items]
Net sales	(17,249)	[1]	(9,793)	[1]	(31,154)	[1]	(23,624)	[1]
Cost of goods sold	(17,249)	[1]	(9,787)	[1]	(31,154)	[1]	(23,572)	[1]
Gross profit		[1]	(6)	[1]		[1]	(52)	[1]
Selling, general and administrative		[1]	(36)	[1]		[1]	(98)	[1]
Depreciation and amortization		[1]		[1]		[1]		[1]
Operating profit (loss)		[1]	$ 30	[1]		[1]	$ 46	[1]

[1] Represents intersegment sales to the Company's retail operations.