Schedule of Operations by Segment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Segment Reporting Information [Line Items]
Total net sales	$ 3,323,077us-gaap_SalesRevenueNet	$ 3,086,608us-gaap_SalesRevenueNet	$ 2,794,925us-gaap_SalesRevenueNet
General corporate expenses	(43,265)	(29,257)	(27,027)
Total income from operations	365,385us-gaap_OperatingIncomeLoss	426,831us-gaap_OperatingIncomeLoss	374,285us-gaap_OperatingIncomeLoss
Total depreciation expense for property and equipment	131,414us-gaap_Depreciation	121,732us-gaap_Depreciation	113,388us-gaap_Depreciation
Total inventories	358,237us-gaap_InventoryNet	311,207us-gaap_InventoryNet
Total property and equipment, net	889,232us-gaap_PropertyPlantAndEquipmentNet	806,909us-gaap_PropertyPlantAndEquipmentNet
Total cash paid for property and equipment	229,804	186,101	168,875
Operating Segments
Segment Reporting Information [Line Items]
Total income from operations	408,650	456,088	401,312
Operating Segments \| Retail Operations
Segment Reporting Information [Line Items]
Total net sales	3,097,274	2,908,981	2,646,284
Total income from operations	354,326	414,734	366,139
Total depreciation expense for property and equipment	130,383	120,960	112,645
Total inventories	314,940	282,590
Total property and equipment, net	885,200	802,965
Total cash paid for property and equipment	228,682	184,255	168,530
Operating Segments \| Wholesale Operations
Segment Reporting Information [Line Items]
Total net sales	237,491	185,792	154,957
Total income from operations	55,403	42,191	35,783
Total depreciation expense for property and equipment	1,031	772	743
Total inventories	43,297	28,617
Total property and equipment, net	4,032	3,944
Total cash paid for property and equipment	1,122	1,846	345
Intersegment Elimination
Segment Reporting Information [Line Items]
Total net sales	(11,688)	(8,165)	(6,316)
Total income from operations	$ (1,079)	$ (837)	$ (610)

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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