U.K. Pension Plan Funded Status (Details) - Freightliner U.K. Pension Plan [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Mar. 25, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, contribution percent by employer		60.00%
Defined benefit plan, contribution percent by participant		40.00%
Projected benefit obligation (100%)	$ 580,054	$ 607,003
Fair value of plan assets (100%)	462,177	450,281
Funded status (100%)	(117,877)	(156,722)
Employees' share of deficit (40%)	(47,152)	(62,689)
Net pension liability recognized in the balance sheet (60%)	(70,725)	(94,033)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	348,033	364,202	$ 359,941
Service cost	10,911	11,816
Interest cost	8,475	10,992
Benefits paid	(5,890)	(8,853)
Actuarial loss/(gain)	(21,731)	59,008
Exchange rate changes	(3,673)	(56,794)
Benefit obligation at end of period	348,033	364,202	359,941
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	277,308	270,169	274,787
Actual return on plan assets	1,609	38,360
Benefits paid	(5,890)	(8,853)
Employer contributions	9,606	8,607
Exchange rate changes	(2,804)	(45,253)
Fair value of plan assets at end of year	277,308	270,169	$ 274,787
Funded status	$ (70,725)	$ (94,033)