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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Jul. 31, 2015 | Jan. 31, 2015 | Jul. 31, 2014
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 144,583 | $ 208,587 | $ 263,674
Unrealized Gains | 221 | 233 | 375
Unrealized (Losses) | (114) | (126) | (182)
Fair Value | 144,690 | 208,694 | 263,867
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 71,943 | 104,201 | 106,641
Unrealized Gains | 44 | 71 | 96
Unrealized (Losses) | (61) | (26) | (16)
Fair Value | 71,926 | 104,246 | 106,721
Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 72,640 | 104,386 | 157,033
Unrealized Gains | 177 | 162 | 279
Unrealized (Losses) | (53) | (100) | (166)
Fair Value | 72,764 | 104,448 | 157,146
Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 55,699 | 103,326 | 148,923
Corporate Bonds | Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 37,961 | 56,594 | 55,849
Unrealized Gains | 1 | 20 | 50
Unrealized (Losses) | (60) | (24) | (15)
Fair Value | 37,902 | 56,590 | 55,884
Corporate Bonds | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 17,835 | 46,754 | 93,086
Unrealized Gains | 1 | 22 | 96
Unrealized (Losses) | (39) | (40) | (143)
Fair Value | 17,797 | 46,736 | 93,039
Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 77,534 | 73,495 | 74,526
Municipal And Pre-Refunded Municipal Bonds | Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 31,983 | 30,509 | 29,022
Unrealized Gains | 43 | 41 | 29
Unrealized (Losses) | (1) | (2) | (1)
Fair Value | 32,025 | 30,548 | 29,050
Municipal And Pre-Refunded Municipal Bonds | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 45,405 | 42,840 | 45,387
Unrealized Gains | 110 | 113 | 107
Unrealized (Losses) | (6) | (6) | (18)
Fair Value | 45,509 | 42,947 | 45,476
Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 6,435 | 14,198 | 16,850
Certificates of Deposit | Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,999 | 11,127 | 14,348
Unrealized Gains |  | 5 | 9
Fair Value | 1,999 | 11,132 | 14,357
Certificates of Deposit | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 4,436 | 3,066 | 2,493
Fair Value | 4,436 | 3,066 | 2,493
Treasury Bills |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value |  | 9,156 | 15,803
Treasury Bills | Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 2,033 | 4,530
Unrealized Gains |  | 3 | 4
Fair Value |  | 2,036 | 4,534
Treasury Bills | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 7,111 | 11,264
Unrealized Gains |  | 9 | 5
Fair Value |  | 7,120 | 11,269
Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value |  | 3,940 | 2,896
Commercial Paper | Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 3,938 | 2,892
Unrealized Gains |  | 2 | 4
Fair Value |  | 3,940 | 2,896
Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 5,022 | 3,778 | 3,089
Mutual Funds, Held in Rabbi Trust | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 4,964 | 3,816 | 3,026
Unrealized Gains | 66 | 16 | 68
Unrealized (Losses) | (8) | (54) | (5)
Fair Value | $ 5,022 | 3,778 | 3,089
Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value |  | 801 | 1,780
Federal Government Agencies | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 799 | 1,777
Unrealized Gains |  | 2 | 3
Fair Value |  | $ 801 | $ 1,780

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