Fair Value (Tables)

9 Months Ended

Oct. 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 tables below:

	Marketable Securities Fair Value as of October 31, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Municipal and pre-refunded municipal bonds	$	—	$	61,523	$	—	$	61,523
Corporate bonds		52,408		—		—		52,408
Certificates of deposit		—		4,641		—		4,641
Mutual funds, held in rabbi trust		5,111		—		—		5,111
	$	57,519	$	66,164	$	—	$	123,683

	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 October 31, 2014
	Level 1		Level 2		Level 3		Total
Assets:
Municipal and pre-refunded municipal bonds	$	—	$	65,155	$	—	$	65,155
Corporate bonds		130,362		—		—		130,362
Certificates of deposit		—		15,668		—		15,668
Mutual funds, held in rabbi trust		3,529		—		—		3,529
Treasury bills		8,726		—		—		8,726
Commercial paper		—		3,593		—		3,593
Federal government agencies		2,572		—		—		2,572
	$	145,189	$	84,416	$	—	$	229,605