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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2014 | Jan. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 647,483 | $ 378,393
Unrealized Gains | 1,002 | 438
Unrealized (Losses) | (250) | (760)
Fair Value | 648,235 | 378,071
Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 281,674 | 228,286
Unrealized Gains | 184 | 242
Unrealized (Losses) | (45) | (42)
Fair Value | 281,813 | 228,486
Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 365,809 | 150,107
Unrealized Gains | 818 | 196
Unrealized (Losses) | (205) | (718)
Fair Value | 366,422 | 149,585
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 309,423 | 152,775
Corporate Bonds | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 100,856 | 88,432
Unrealized Gains | 56 | 106
Unrealized (Losses) | (41) | (23)
Fair Value | 100,871 | 88,515
Corporate Bonds | Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 208,446 | 64,219
Unrealized Gains | 268 | 102
Unrealized (Losses) | (162) | (61)
Fair Value | 208,552 | 64,260
Municipal And Pre-Refunded Municipal Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 211,437 | 116,364
Municipal And Pre-Refunded Municipal Bonds | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 85,000 | 63,355
Unrealized Gains | 98 | 85
Unrealized (Losses) | (2) | (17)
Fair Value | 85,096 | 63,423
Municipal And Pre-Refunded Municipal Bonds | Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 125,934 | 52,925
Unrealized Gains | 415 | 76
Unrealized (Losses) | (8) | (60)
Fair Value | 126,341 | 52,941
US Treasury Bill Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 46,455 | 41,105
US Treasury Bill Securities | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 24,873 | 21,354
Unrealized Gains | 10 | 14
Fair Value | 24,883 | 21,368
US Treasury Bill Securities | Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 21,551 | 19,724
Unrealized Gains | 21 | 13
Fair Value | 21,572 | 19,737
Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 39,854 | 43,235
Certificates of Deposit | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 35,844 | 40,870
Unrealized Gains | 13 | 25
Unrealized (Losses) | (1) |
Fair Value | 35,856 | 40,895
Certificates of Deposit | Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,000 | 2,340
Unrealized (Losses) | (2) |
Fair Value | 3,998 | 2,340
Commercial Paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 35,107 | 10,781
Commercial Paper | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 35,101 | 10,775
Unrealized Gains | 7 | 8
Unrealized (Losses) | (1) | (2)
Fair Value | 35,107 | 10,781
US Government Corporations and Agencies Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 4,293 | 9,481
US Government Corporations and Agencies Securities | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 3,500
Unrealized Gains |  | 4
Fair Value |  | 3,504
US Government Corporations and Agencies Securities | Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,287 | 5,974
Unrealized Gains | 6 | 5
Unrealized (Losses) |  | (2)
Fair Value | 4,293 | 5,977
Mutual funds, held in rabbi trust |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,666 |
Mutual funds, held in rabbi trust | Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,591 |
Unrealized Gains | 108 |
Unrealized (Losses) | (33) |
Fair Value | 1,666 |
Auction Rate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value |  | 4,330
Auction Rate Securities | Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 4,925
Unrealized (Losses) |  | (595)
Fair Value |  | $ 4,330

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