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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2018	Dec. 31, 2018	Jan. 31, 2018	Apr. 30, 2018
Schedule Of Income Tax [Line Items]
U.S. corporate federal statutory income tax rate		35.00%
Provisional tax charge for the Transition Tax			$ 16.3
Provisional tax benefit from remeasurement of U.S. federal deferred tax assets and liabilities			$ 5.8
Scenario, Forecast
Schedule Of Income Tax [Line Items]
U.S. corporate federal statutory income tax rate	21.00%			30.40%
One-time tax on accumulated foreign earnings (Transition Tax), applicable rate on cash and other specified assets	15.50%
One-time tax on accumulated foreign earnings (Transition Tax), applicable rate on other residual earnings	8.00%

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Effective income tax rate reconciliation tax cuts and jobs act of 2017 transition tax on deferred foreign income other residual earnings.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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-Topic 740
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-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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