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

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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