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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Jan. 31, 2017 | Jan. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 155,330 | $ 97,854
Unrealized Gains | 170 | 116
Unrealized (Losses) | (145) | (309)
Fair Value | 155,355 | 97,661
Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 111,134 | 61,043
Unrealized Gains | 35 | 43
Unrealized (Losses) | (102) | (25)
Fair Value | 111,067 | 61,061
Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 44,196 | 36,811
Unrealized Gains | 135 | 73
Unrealized (Losses) | (43) | (284)
Fair Value | 44,288 | 36,600
Municipal And Pre-Refunded Municipal Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 71,261 | 44,360
Municipal And Pre-Refunded Municipal Bonds | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 51,731 | 26,243
Unrealized Gains | 28 | 33
Unrealized (Losses) | (12) |
Fair Value | 51,747 | 26,276
Municipal And Pre-Refunded Municipal Bonds | Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 19,488 | 18,028
Unrealized Gains | 35 | 58
Unrealized (Losses) | (9) | (2)
Fair Value | 19,514 | 18,084
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 78,398 | 46,071
Corporate Bonds | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 59,403 | 33,885
Unrealized Gains | 7 | 10
Unrealized (Losses) | (90) | (25)
Fair Value | 59,320 | 33,870
Corporate Bonds | Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 19,102 | 12,227
Unrealized Gains | 9 | 9
Unrealized (Losses) | (33) | (35)
Fair Value | 19,078 | 12,201
Mutual Funds, Held in Rabbi Trust |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 4,673 | 4,363
Mutual Funds, Held in Rabbi Trust | Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,583 | 4,604
Unrealized Gains | 91 | 6
Unrealized (Losses) | (1) | (247)
Fair Value | 4,673 | 4,363
Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,023 | 2,867
Certificates of Deposit | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 915
Fair Value |  | 915
Certificates of Deposit | Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,023 | 1,952
Fair Value | $ 1,023 | $ 1,952

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