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Acquisition - Summary of Assets Acquired at Estimated Relative Fair Values (Parenthetical) (Detail) $ in Millions	Jan. 31, 2019 USD ($)
TSA [Member]
Purchase Price Allocation [Line Items]
Identifiable Intangible Assets	$ 0.4

X

- Definition

Purchase Price Allocation [Line Items]

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258

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Balance Type:	debit
Period Type:	instant

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- Details

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