Income Taxes (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019 USD ($) item	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	85.30%	22.10%	37.60%	20.50%
Loss on Cash Flow Hedge Ineffectiveness | $			$ 28.0
Number of operating units benefit from local tax incentives | item			3
U.S. federal corporate tax rate			21.00%