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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jan. 31, 2017 | Jan. 31, 2016
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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 | $ 155,355 | $ 97,661
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 | 78,398 | 46,071
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 | 71,261 | 44,360
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 | 4,673 | 4,363
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 | 1,023 | 2,867
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 | 83,071 | 50,434
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 | 78,398 | 46,071
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 | 4,673 | 4,363
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 | 72,284 | 47,227
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 | 71,261 | 44,360
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 | $ 1,023 | $ 2,867

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