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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jan. 31, 2018 | Jan. 31, 2017
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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 | $ 223,813 | $ 155,355
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets accounted for at fair value on a recurring basis | 223,813 | 155,355
Fair Value, Measurements, Recurring | 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 | 151,053 | 78,398
Fair Value, Measurements, Recurring | 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 | 62,303 | 71,261
Fair Value, Measurements, Recurring | 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 | 6,237 | 4,673
Fair Value, Measurements, Recurring | 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 | 4,220 | 1,023
Fair Value, Measurements, Recurring | 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 | 157,290 | 83,071
Fair Value, Measurements, Recurring | 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 | 151,053 | 78,398
Fair Value, Measurements, Recurring | 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 | 6,237 | 4,673
Fair Value, Measurements, Recurring | 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 | 66,523 | 72,284
Fair Value, Measurements, Recurring | 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 | 62,303 | 71,261
Fair Value, Measurements, Recurring | 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 | $ 4,220 | $ 1,023

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