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Schedule of Revenues and Long-Lived Assets, by Domestic and Foreign Operations Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Jan. 31, 2015
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 899,324us-gaap_PropertyPlantAndEquipmentNet	$ 836,244us-gaap_PropertyPlantAndEquipmentNet	$ 889,232us-gaap_PropertyPlantAndEquipmentNet
Total net sales	739,010us-gaap_SalesRevenueNet	686,310us-gaap_SalesRevenueNet
Domestic Operations
Segment Reporting Information [Line Items]
Total property and equipment, net	755,890	685,195	745,504
Total net sales	649,718	600,913
Foreign Operations
Segment Reporting Information [Line Items]
Total property and equipment, net	143,434	151,049	143,728
Total net sales	$ 89,292	$ 85,397