Contingencies, Significant Estimates and Concentrations (Tables)

12 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of significant portion of revenues from the Department of Defense

The Company derived a significant portion of its revenue from the DoD, as follows (in millions):

	Fiscal Year Ended September 30,
	2018		2017		2016
DoD	$	1,648.4	$	1,314.6	$	1,205.0
Foreign military sales	28.0		32.1		1.8
Total DoD sales	$	1,676.4	$	1,346.7	$	1,206.8