Organization Consolidation And Presentation Of Financial Statements [Line Items]

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- Definition

Proceeds from issuance initial public offering net of underwriting discount and expenses.

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No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-Publisher FASB
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- Definition

Amount of investment in equity method investee and investment in and advance to affiliate.

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- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

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- Definition

Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Basis of Presentation - Additional Information (Detail) $ / shares in Units, $ in Millions		9 Months Ended
	Feb. 01, 2017 USD ($) $ / shares shares	Jul. 31, 2018 USD ($)	Jul. 29, 2017 USD ($)	Apr. 30, 2018 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net proceeds after deducting underwriting discount and expenses			$ 253.6
Stock split ratio		80
IPO [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Issuance of common stock \| shares	12,500,000
Price per share \| $ / shares	$ 22.00
Gross proceeds	$ 275.0
Net proceeds after deducting underwriting discount and expenses	$ 253.6
China JV [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Investments in joint ventures		$ 6.7		$ 0.9
Equity interest in joint ventures		40.00%		10.00%
Loan interest rate		5.00%