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Fair Value (Tables)

9 Months Ended

Oct. 31, 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
		October 31, 2018
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	225,062			$	—			$	—			$	225,062
Municipal and pre-refunded    municipal bonds			—				35,798				—				35,798
Mutual funds, held in rabbi trust			6,459				—				—				6,459
Certificates of deposit			—				3,145				—				3,145
Commercial paper			—				2,960				—				2,960
		$	231,521			$	41,903			$	—			$	273,424

		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
		October 31, 2017
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	97,172			$	—			$	—			$	97,172
Municipal and pre-refunded    municipal bonds			—				26,026				—				26,026
Mutual funds, held in rabbi trust			5,746				—				—				5,746
Certificates of deposit			—				5,538				—				5,538
		$	102,918			$	31,564			$	—			$	134,482

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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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Data Type:	xbrli:stringItemType
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