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Fair Value (Tables)

3 Months Ended

Apr. 30, 2014

Financial Assets Measured at Fair Value on Recurring Basis

The Company’s financial assets that are accounted for at fair value on a recurring basis are presented in the table below:


		Marketable Securities Fair Value as of April 30, 2014
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	140,411			$	—			$	—			$	140,411
Municipal and pre-refunded municipal bonds			—				113,238				—				113,238
Certificates of deposit			—				24,857				—				24,857
Commercial paper			—				24,684				—				24,684
Treasury bills			17,914				—				—				17,914
Mutual funds, held in rabbi trust			2,600				—				—				2,600
Federal government agencies			1,786				—				—				1,786

		$	162,711			$	162,779			$	—			$	325,490


		Marketable Securities Fair Value as of January 31, 2014
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	309,423			$	—			$	—			$	309,423
Municipal and pre-refunded municipal bonds			—				211,437				—				211,437
Certificates of deposit			—				39,854				—				39,854
Commercial paper			—				35,107				—				35,107
Treasury bills			46,455				—				—				46,455
Mutual funds, held in rabbi trust			1,666				—				—				1,666
Federal government agencies			4,293				—				—				4,293

		$	361,837			$	286,398			$	—			$	648,235


		Marketable Securities Fair Value as of April 30, 2013
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	153,376			$	—			$	—			$	153,376
Municipal and pre-refunded municipal bonds			—				126,594				—				126,594
Certificates of deposit			—				42,345				—				42,345
Commercial paper			—				8,482				—				8,482
Treasury bills			21,731				—				—				21,731
Mutual funds, held in rabbi trust			337				—				—				337
Federal government agencies			11,844				—				—				11,844

		$	187,288			$	177,421			$	—			$	364,709