Per Share Data (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended		9 Months Ended
	Jul. 10, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		$ (145,000)	$ 7,156,000	$ 235,000	$ 7,314,000
Net Income (Loss) Attributable to Noncontrolling Interest		(4,000)	(6,000)	4,000	(6,000)
Net Income (Loss) Attributable to Parent		$ (141,000)	$ 7,162,000	$ 231,000	$ 7,320,000
Basic weighted average common shares outstanding		4,078	4,001	4,050	3,998
Diluted weighted average common shares outstanding		4,078	4,061	4,110	4,080
Basic net (loss) income per common share		$ (0.03)	$ 1.79	$ 0.06	$ 1.83
Diluted net (loss) income per common share		$ (0.03)	$ 1.76	$ 0.06	$ 1.79
Options and RSUs [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			6
Options and Restricted Stock Units [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of shares that had no effect on computation of dilutive weighted average number of shares outstanding		0	47	56	61
Warrant [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of shares that had no effect on computation of dilutive weighted average number of shares outstanding		0	13	4	21
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	55
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 5.25
Proceeds from Warrant Exercises	$ 287,000
Warrant [Member] | SoftBank [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of shares that had no effect on computation of dilutive weighted average number of shares outstanding			9	1	17
Employee Stock Option [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		96		6	6