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Fair Value (Tables)

6 Months Ended

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

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


		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
Mutual funds, held in rabbi trust			1,666				—				—				1,666
Commercial paper			—				35,107				—				35,107
Federal government agencies			4,293				—				—				4,293

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


		Marketable Securities Fair Value as of July 31, 2013
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	175,229			$	—			$	—			$	175,229
Municipal and pre-refunded municipal bonds			—				192,361				—				192,361
Certificates of deposit			—				33,694				—				33,694
Treasury bills			24,344				—				—				24,344
Mutual funds, held in rabbi trust			852				—				—				852
Commercial paper			—				8,292				—				8,292
Federal government agencies			7,793				—				—				7,793

		$	208,218			$	234,347			$	—			$	442,565