Financial Statement Presentation (Details 2)	3 Months Ended
	Mar. 31, 2018 weeks operating_segments Months
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Fiscal Period Weeks Standard for U.S. subsidiaries and certain international subsidiaries | weeks	12
Fiscal Period Weeks Standard Fourth Quarter | weeks	16
Number of Reportable Segments | operating_segments	3
Fiscal period months standard first quarter	2
Fiscal period months standard second and third quarters	3
Fiscal period months standard fourth quarter	4