- (Additional Information) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2017	Jan. 01, 2017	Mar. 31, 2018
Income Tax Contingency [Line Items]
Provisional income tax expense comprised of foreign tax effects and deferred tax assets and liabilities	$ 77,347
Transition tax	94,000
Current portion of transition tax liability	7,520
Noncurrent portion of transition tax liability	86,480
Tax benefit from remeasurement of deferred tax balance	14,706
Provisional tax benefit related to reduction of federal tax rate	$ 1,947
Effective income tax rates	141.20%	26.70%	63.20%	25.70%
Foreign income as a percentage or worldwide income			$ 0.64	$ 0.60
Foreign effective income tax rates			11.40%	15.90%
Tax rate of Swiss subsidiary			6.00%
Scenario, Forecast
Income Tax Contingency [Line Items]
Blended federal statutory tax rate					31.50%