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Fair Value (Tables)

6 Months Ended

Jul. 31, 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 July 31, 2015
		Level 1				Level 2				Level 3				Total
Assets:
Municipal and pre-refunded municipal bonds		$	—			$	77,534			$	—			$	77,534
Corporate bonds			55,699				—				—				55,699
Certificates of deposit			—				6,435				—				6,435
Mutual funds, held in rabbi trust			5,022				—				—				5,022

		$	60,721			$	83,969			$	—			$	144,690


		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
Certificates of deposit			—				14,198				—				14,198
Mutual funds, held in rabbi trust			3,778				—				—				3,778
Treasury bills			9,156				—				—				9,156
Commercial paper			—				3,940				—				3,940
Federal government agencies			801				—				—				801

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


		Marketable Securities Fair Value as of July 31, 2014
		Level 1				Level 2				Level 3				Total
Assets:
Municipal and pre-refunded municipal bonds		$	—			$	74,526			$	—			$	74,526
Corporate bonds			148,923				—				—				148,923
Certificates of deposit			—				16,850				—				16,850
Mutual funds, held in rabbi trust			3,089				—				—				3,089
Treasury bills			15,803				—				—				15,803
Commercial paper			—				2,896				—				2,896
Federal government agencies			1,780				—				—				1,780

		$	169,595			$	94,272			$	—			$	263,867