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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 | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2013 | Jul. 31, 2012 | Jan. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Total property and equipment, net | $ 731,421 | $ 722,058 | $ 731,421 | $ 722,058 | $ 733,416
Total net sales | 758,524 | 676,269 | 1,406,701 | 1,245,199 |
Domestic Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total property and equipment, net | 589,834 | 582,859 | 589,834 | 582,859 | 586,068
Total net sales | 661,486 | 587,221 | 1,231,053 | 1,087,829 |
Foreign Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total property and equipment, net | 141,587 | 139,199 | 141,587 | 139,199 | 147,348
Total net sales | $ 97,038 | $ 89,048 | $ 175,648 | $ 157,370 |

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