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Leases - Additional Information (Details) - USD ($)	9 Months Ended
	Oct. 31, 2019	Jan. 31, 2019
Lessee Lease Description [Line Items]
Finance lease agreements term	4 years
Sublease expiration year	2023
Operating leases, undiscounted future payments	$ 17,200,000
Finance lease,not yet commenced	0
Asset retirement obligation		$ 0
Other Long-term Liabilities
Lessee Lease Description [Line Items]
Asset retirement obligation	$ 2,800,000
Minimum
Lessee Lease Description [Line Items]
Operating lease expiration year	2020
Term of sublease arrangement	31 months
Operating lease has not yet commenced lease term	4 years
Maximum
Lessee Lease Description [Line Items]
Operating lease expiration year	2029
Term of sublease arrangement	55 months
Operating lease has not yet commenced lease term	5 years

X

- Definition

Lessee finance lease, lease not yet commenced.

+ References

No definition available.

+ Details

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- Definition

Lessee, operating lease, lease not yet commenced undiscounted future payments.

+ References

No definition available.

+ Details

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X

- Definition

Non cancellable lease expiration year.

+ References

No definition available.

+ Details

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- Definition

Operating lease expiration year.

+ References

No definition available.

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- Definition

Sublease term.

+ References

No definition available.

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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X

- Definition

Term of lessee's finance 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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- 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.

+ Details

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- Definition

Term of lessee's operating lease not yet commenced, 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 (b)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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