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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, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Jan. 31, 2018
Segment Reporting Information [Line Items]
Total property and equipment, net	$ 808,883	$ 829,106	$ 808,883	$ 829,106	$ 813,768
Total net sales	973,533	892,774	2,821,675	2,526,895
Domestic Operations
Segment Reporting Information [Line Items]
Total property and equipment, net	734,622	735,731	734,622	735,731	720,890
Total net sales	854,347	779,790	2,467,015	2,222,589
Foreign Operations
Segment Reporting Information [Line Items]
Total property and equipment, net	74,261	93,375	74,261	93,375	$ 92,878
Total net sales	$ 119,186	$ 112,984	$ 354,660	$ 304,306

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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