Equity-Accounted Investments And Other Long-Term Assets (Schedule Of Calculation Of Expected Gain (Loss) On Disposal Of DNI) (Details) - DNI [Member] - USD ($)	Apr. 01, 2020	May 03, 2019
Asset Held-for-sale or Disposed of by Sale [Member] | Net1 SA [Member]
Long Lived Assets Held For Sale Line Items [Line Items]
Less: transaction costs	$ (1,010,000)
Less: carrying value of DNI	(36,508,000)
Less: release of foreign currency translation reserve from accumulated other comprehensive loss (Note 1 and Note 16)	(11,323,000)
Gain (loss) on sale of DNI before tax	(1,010,000)
Capital gains (loss) tax related to sale of DNI	2,475,000
Utilization of capital loss carryforwards	(2,475,000)
Gain (loss) on disposal of DNI after tax	(1,010,000)
Utilized capital losses as a result of the disposal of remaining interest in DNI	12,000,000
Asset Held-for-sale or Disposed of by Sale [Member] | Cash [Member] | Net1 SA [Member]
Long Lived Assets Held For Sale Line Items [Line Items]
Consideration received	$ 42,477,000
Investment shares owned	26,886,310
Asset Held-for-sale or Disposed of by Sale [Member] | Notes Receivable [Member] | Cash [Member] | Net1 SA [Member]
Long Lived Assets Held For Sale Line Items [Line Items]
Consideration received	$ 5,354,000
Investment shares owned	3,508,455
Disposal of 8% Retained Interest In DNI [Member]
Long Lived Assets Held For Sale Line Items [Line Items]
Consideration received		$ 15,011,000
Less: carrying value of DNI		(14,996,000)
Less: release of foreign currency translation reserve from accumulated other comprehensive loss (Note 1 and Note 16)		162,000
Gain (loss) on sale of DNI before tax		177,000
Capital gains (loss) tax related to sale of DNI		0
Gain (loss) on disposal of DNI after tax		$ 177,000