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Securities Available for Sale - Additional Information (Detail)	12 Months Ended
	Jan. 31, 2017 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Impairment charges on available for sale security	$ 0
Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Original maturity of short-term investments	90 days
Anticipated maturity period	1 month
Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Anticipated maturity period	2 years

X

- Definition

Available For Sale Securities Expected Maturity Period

+ References

No definition available.

+ Details

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- Definition

Minimum number of days that short-term investments would mature.

+ References

No definition available.

+ Details

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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