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Subsequent Events- Additional Information (Detail) $ in Millions	May 07, 2021 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2021 AUD ($)	Apr. 30, 2021 USD ($)
HMH Books and Media
Subsequent Event [Line Items]
Cash payments to acquire additional interests		$ 349,000,000
Mortgage Choice Limited \| REA Group
Subsequent Event [Line Items]
Cash payments to acquire additional interests		$ 186,500,000	$ 244
Subsequent Event \| Senior Notes \| Senior Notes Due 2029
Subsequent Event [Line Items]
Debt amount				$ 1,000,000,000
Interest rate				3.875%
Subsequent Event \| Investor's Business Daily
Subsequent Event [Line Items]
Consideration transferred	$ 275,000,000