Income Taxes - Summary of Major Tax Jurisdictions and Fiscal Years Open to Examination (Detail)	12 Months Ended
	Jun. 30, 2019
U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Fiscal Years Open to Examination	2014 2016 2017 2018
U.S. States [Member]
Operating Loss Carryforwards [Line Items]
Fiscal Years Open to Examination	Various
Foreign Tax Authority [Member] | Australia [Member]
Operating Loss Carryforwards [Line Items]
Fiscal Years Open to Examination	2015 2016 2017 2018
Foreign Tax Authority [Member] | U.K. [Member]
Operating Loss Carryforwards [Line Items]
Fiscal Years Open to Examination	2011 2012 2013 2014 2015 2016 2017 2018