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Fair Value (Tables)

9 Months Ended

Oct. 31, 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 tables below:


		Marketable Securities Fair Value as of October 31, 2014
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	130,362			$	—			$	—			$	130,362
Municipal and pre-refunded municipal bonds			—				65,155				—				65,155
Certificates of deposit			—				15,668				—				15,668
Treasury bills			8,726				—				—				8,726
Commercial paper			—				3,593				—				3,593
Mutual funds, held in rabbi trust			3,529				—				—				3,529
Federal government agencies			2,572				—				—				2,572

		$	145,189			$	84,416			$	—			$	229,605


		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
Treasury bills			46,455				—				—				46,455
Commercial paper			—				35,107				—				35,107
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 October 31, 2013
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	234,041			$	—			$	—			$	234,041
Municipal and pre-refunded municipal bonds			—				207,397				—				207,397
Certificates of deposit			—				28,752				—				28,752
Treasury bills			22,274				—				—				22,274
Commercial paper			—				28,167				—				28,167
Mutual funds, held in rabbi trust			1,328				—				—				1,328
Federal government agencies			8,788				—				—				8,788

		$	266,431			$	264,316			$	—			$	530,747