Corporate Restructuring - Additional Information (Details) $ in Millions		3 Months Ended	6 Months Ended
May 16, 2018 Employee	Nov. 03, 2018 USD ($)	Nov. 03, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Corporate restructuring plan expected initiation, date	May 16, 2018
Number of positions eliminated	56
Percentage of positions eliminated from work force	15.00%
Percentage of total work force eliminated as a part of corporate restructuring plan	2.00%
Number of employees notified of their termination \| Employee	36
Number of positions representing open that will not be filled	20
Restructuring and cost remaining cash expenditures		$ 1.5
Accrued liability related to restructuring		0.3	$ 0.3
Severance, One-time Termination Benefits and Other Employee-related Costs
Restructuring Cost And Reserve [Line Items]
Corporate restructuring		$ 0.3	$ 1.9

Number of positions representing open that will not be filled.

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Restructuring and related cost number of employees notified of their termination.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Date the restructuring activities were initiated or are expected to be initiated, in CCYY-MM-DD format.

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The number of positions eliminated during the period as a result of restructuring activities.

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Percentage of the total number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s).

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The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s).

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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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.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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