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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018	Nov. 27, 2017
Commitments And Contingencies [Line Items]
Non-cancellable sublease expiration year	2022
Rent expense	$ 8.3	$ 5.3
Sublease income	1.9	$ 1.9
Subleases Expire in Fiscal 2018 and 2021
Commitments And Contingencies [Line Items]
Non-cancellable sublease proceeds for the year ending January 31, 2019	5.5
Non-cancellable sublease proceeds for the year ending January 31, 2020	3.6
Non-cancellable sublease proceeds for the year ending January 31, 2021	2.7
Non-cancellable sublease proceeds for the year ending January 31, 2022	$ 0.6
Minimum
Commitments And Contingencies [Line Items]
Operating lease expiration year	2019
Capital lease initial term	3 years
Term of sublease arrangement	19 months
Maximum
Commitments And Contingencies [Line Items]
Operating lease expiration year	2029
Capital lease initial term	4 years
Term of sublease arrangement	49 months
November 2017 Facility | Letters of Credit | Secured Debt | Wells Fargo Bank
Commitments And Contingencies [Line Items]
Agreement entered date	Nov. 27, 2017
Letters of credit facility	$ 26.4		$ 26.4
Line of credit facility, maximum borrowing capacity sublimit				$ 30.0

X

- Definition

Capital lease term.

+ References

No definition available.

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- Definition

Commitments and contingencies.

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- Definition

Line of credit facility maximum borrowing capacity sublimit.

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- Definition

Non cancellable​ sublease ​expiration ​year.

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- Definition

Operating lease expiration year.

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- Definition

Operating leases future minimum payments sublease rentals proceeds due in year four.

+ References

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- Definition

Operating leases future minimum payments sublease rentals proceeds due in year three.

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- Definition

Operating leases future minimum payments sublease rentals proceeds due in year two.

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- Definition

Operating leases future minimum payments sublease rentals proceeds due remainder of fiscal year.

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No definition available.

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- Definition

Sublease term.

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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

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

Date the credit facility first became available, in CCYY-MM-DD format.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The amount of revenue recognized for the period under subleasing arrangements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 55
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=77891322&loc=d3e41620-112719

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