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Method of Overhead Allocation (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 472,756 | $ 668,702 | $ 304,158 | $ 272,615 | $ 375,278 | $ 543,513 | $ 251,479 | $ 229,449 | $ 1,718,231 | $ 1,399,719 | $ 1,231,201
Long-Lived Assets | 244,707 |  |  |  | 201,188 |  |  |  | 244,707 | 201,188 | 81,325
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,528,473 | 1,333,885 | 1,185,800
Long-Lived Assets | 106,638 |  |  |  | 81,606 |  |  |  | 106,638 | 81,606 | 80,817
Non-United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 189,758 | 65,834 | 45,401
Long-Lived Assets | $ 138,069 |  |  |  | $ 119,582 |  |  |  | $ 138,069 | $ 119,582 | $ 508

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