Description of Operations (Details)	Mar. 31, 2019	Apr. 29, 2018 shares	Jul. 10, 2013
Nature of Operations [Line Items]
Exchange Ratio		0.10256
Equivalent Shares		9.75
SoftBank Merger [Member]
Nature of Operations [Line Items]
Voting interest acquired (as a percent)	85.00%		78.00%
Deutsche Telekom [Member]
Nature of Operations [Line Items]
Fully diluted shares, percentage owned		42.00%
SoftBank [Member]
Nature of Operations [Line Items]
Fully diluted shares, percentage owned		27.00%