Income Taxes - Summary of Tax Years Remain Subject to Examinations under Major Tax Jurisdictions (Detail)	12 Months Ended
	Apr. 30, 2021
Earliest Tax Year | United States - State and Local Income Tax
Income Tax Examination [Line Items]
Tax year subject to examination	2012
Latest Tax Year | United States - State and Local Income Tax
Income Tax Examination [Line Items]
Tax year subject to examination	2021
Federal Income Tax | Earliest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2016
Federal Income Tax | Latest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2021
Australia | Earliest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2014
Australia | Latest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2021
Germany | Earliest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2015
Germany | Latest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2021
India | Earliest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2007
India | Latest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2021
Japan | Earliest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2014
Japan | Latest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2021
The Netherlands | Earliest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2017
The Netherlands | Latest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2021
United Kingdom | Earliest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2016
United Kingdom | Latest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2021
Canada | Earliest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2016
Canada | Latest Tax Year
Income Tax Examination [Line Items]
Tax year subject to examination	2021