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Commitments and Contingencies (Detail) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2014 USD ($) a	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Jan. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Rent expense		$ 25,000	$ 21,000	$ 72,000	$ 60,000
Lease term period	95 years
Parcel of vacant land (in acres) | a	6.9
Prepayments for computing infrastructure platform	$ 2,000	$ 10,738		10,738		$ 13,588
Annual rent payments plus increases based on increases in consumer price index				$ 200

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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Sum of the carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Area Of Land Leased

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Lease Annual Rent Payments

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