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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 | Jul. 31, 2013 | Jan. 31, 2013 | Jul. 31, 2012
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 442,558 | $ 378,393 | $ 227,773
Unrealized Gains | 355 | 438 | 434
Unrealized (Losses) | (348) | (760) | (653)
Fair Value | 442,565 | 378,071 | 227,554
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 225,725 | 228,286 | 135,715
Unrealized Gains | 120 | 242 | 192
Unrealized (Losses) | (46) | (42) | (17)
Fair Value | 225,799 | 228,486 | 135,890
Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 216,833 | 150,107 | 92,058
Unrealized Gains | 235 | 196 | 242
Unrealized (Losses) | (302) | (718) | (636)
Fair Value | 216,766 | 149,585 | 91,664
Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 192,361 | 116,364 | 52,808
Municipal And Pre-Refunded Municipal Bonds | Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 91,819 | 63,355 | 28,019
Unrealized Gains | 61 | 85 | 95
Unrealized (Losses) | (9) | (17) | (7)
Fair Value | 91,871 | 63,423 | 28,107
Municipal And Pre-Refunded Municipal Bonds | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 100,402 | 52,925 | 24,646
Unrealized Gains | 142 | 76 | 78
Unrealized (Losses) | (54) | (60) | (23)
Fair Value | 100,490 | 52,941 | 24,701
Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 175,229 | 152,775 | 101,813
Corporate Bonds | Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 79,637 | 88,432 | 53,713
Unrealized Gains | 22 | 106 | 71
Unrealized (Losses) | (37) | (23) | (8)
Fair Value | 79,622 | 88,515 | 53,776
Corporate Bonds | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 95,795 | 64,219 | 47,905
Unrealized Gains | 51 | 102 | 150
Unrealized (Losses) | (239) | (61) | (18)
Fair Value | 95,607 | 64,260 | 48,037
Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 33,694 | 43,235 | 25,198
Certificates of Deposit | Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 29,870 | 40,870 | 20,671
Unrealized Gains | 24 | 25 | 13
Unrealized (Losses) |  |  | (2)
Fair Value | 29,894 | 40,895 | 20,682
Certificates of Deposit | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,801 | 2,340 | 4,514
Unrealized Gains | 1 |  | 2
Unrealized (Losses) | (2) |  |
Fair Value | 3,800 | 2,340 | 4,516
US Treasury Bill Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 24,344 | 41,105 | 30,295
US Treasury Bill Securities | Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 16,115 | 21,354 | 21,425
Unrealized Gains | 5 | 14 | 5
Fair Value | 16,120 | 21,368 | 21,430
US Treasury Bill Securities | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 8,218 | 19,724 | 8,855
Unrealized Gains | 6 | 13 | 10
Fair Value | 8,224 | 19,737 | 8,865
Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 8,292 | 10,781 | 7,287
Commercial Paper | Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 8,284 | 10,775 | 7,279
Unrealized Gains | 8 | 8 | 8
Unrealized (Losses) |  | (2) |
Fair Value | 8,292 | 10,781 | 7,287
US Government Corporations and Agencies Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 7,793 | 9,481 | 5,823
US Government Corporations and Agencies Securities | Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 3,500 | 4,608
Unrealized Gains |  | 4 |
Fair Value |  | 3,504 | 4,608
US Government Corporations and Agencies Securities | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 7,800 | 5,974 | 1,213
Unrealized Gains |  | 5 | 2
Unrealized (Losses) | (7) | (2) |
Fair Value | 7,793 | 5,977 | 1,215
Mutual funds, held in rabbi trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 852 |  |
Mutual funds, held in rabbi trust | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 817 |  |
Unrealized Gains | 35 |  |
Fair Value | 852 |  |
Auction Rate Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value |  | 4,330 | 4,330
Auction Rate Securities | Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 4,925 | 4,925
Unrealized (Losses) |  | (595) | (595)
Fair Value |  | $ 4,330 | $ 4,330

X
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