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Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2014 | Jan. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | $ 648,235 | $ 378,071
Corporate Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 309,423 | 152,775
Municipal And Pre-Refunded Municipal Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 211,437 | 116,364
US Treasury Bill Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 46,455 | 41,105
Certificates of Deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 39,854 | 43,235
Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 35,107 | 10,781
US Government Corporations and Agencies Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 4,293 | 9,481
Auction Rate Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis |  | 4,330
Mutual funds, held in rabbi trust |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 1,666 |
Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 361,837 | 203,361
Fair Value, Inputs, Level 1 | Corporate Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 309,423 | 152,775
Fair Value, Inputs, Level 1 | US Treasury Bill Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 46,455 | 41,105
Fair Value, Inputs, Level 1 | US Government Corporations and Agencies Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 4,293 | 9,481
Fair Value, Inputs, Level 1 | Mutual funds, held in rabbi trust |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 1,666 |
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 286,398 | 170,380
Fair Value, Inputs, Level 2 | Municipal And Pre-Refunded Municipal Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 211,437 | 116,364
Fair Value, Inputs, Level 2 | Certificates of Deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 39,854 | 43,235
Fair Value, Inputs, Level 2 | Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 35,107 | 10,781
Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis |  | 4,330
Fair Value, Inputs, Level 3 | Auction Rate Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis |  | $ 4,330

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