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Fair Value (Tables)

3 Months Ended

Apr. 30, 2018

Fair Value Disclosures [Abstract]

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
		April 30, 2018
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	128,288			$	—			$	—			$	128,288
Municipal and pre-refunded    municipal bonds			—				62,455				—				62,455
Mutual funds, held in rabbi trust			6,483				—				—				6,483
Certificates of deposit			—				4,220				—				4,220
		$	134,771			$	66,675			$	—			$	201,446

		Marketable Securities Fair Value as of
		January 31, 2018
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	151,053			$	—			$	—			$	151,053
Municipal and pre-refunded    municipal bonds			—				62,303				—				62,303
Mutual funds, held in rabbi trust			6,237				—				—				6,237
Certificates of deposit			—				4,220				—				4,220
		$	157,290			$	66,523			$	—			$	223,813

		Marketable Securities Fair Value as of
		April 30, 2017
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	104,812			$	—			$	—			$	104,812
Municipal and pre-refunded    municipal bonds			—				45,584				—				45,584
Mutual funds, held in rabbi trust			5,072				—				—				5,072
Certificates of deposit			—				1,476				—				1,476
		$	109,884			$	47,060			$	—			$	156,944

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- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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