Schedule of Revenues and Long-Lived Assets, by Domestic and Foreign Operations Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Jan. 31, 2015
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 891,871	$ 886,810	$ 891,871	$ 886,810	$ 889,232
Total net sales	825,258	814,470	2,431,728	2,312,033
Domestic Operations
Segment Reporting Information [Line Items]
Total property and equipment, net	754,284	731,579	754,284	731,579	745,504
Total net sales	720,671	706,090	2,126,877	2,008,765
Foreign Operations
Segment Reporting Information [Line Items]
Total property and equipment, net	137,587	155,231	137,587	155,231	$ 143,728
Total net sales	$ 104,587	$ 108,380	$ 304,851	$ 303,268