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Fair Value (Tables)

3 Months Ended

Apr. 30, 2015

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, 2015
		Level 1				Level 2				Level 3				Total
Assets:
Municipal and pre-refunded municipal bonds		$	—			$	86,924			$	—			$	86,924
Corporate bonds			64,537				—				—				64,537
Treasury bills			11,089				—				—				11,089
Certificates of deposit			—				7,993				—				7,993
Mutual funds, held in rabbi trust			4,686				—				—				4,686
Commercial paper			—				3,945				—				3,945
Federal government agencies			800				—				—				800

		$	81,112			$	98,862			$	—			$	179,974


		Marketable Securities Fair Value as of January 31, 2015
		Level 1				Level 2				Level 3				Total
Assets:
Municipal and pre-refunded municipal bonds		$	—			$	73,495			$	—			$	73,495
Corporate bonds			103,326				—				—				103,326
Treasury bills			9,156				—				—				9,156
Certificates of deposit			—				14,198				—				14,198
Mutual funds, held in rabbi trust			3,778				—				—				3,778
Commercial paper			—				3,940				—				3,940
Federal government agencies			801				—				—				801

		$	117,061			$	91,633			$	—			$	208,694


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

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