Geographic Information (Tables)

12 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Schedule of Revenues from External Customers by Geographical Areas

Revenues by country represent sales to unaffiliated customers as determined by the ultimate destination of our products and services, summarized for the last three fiscal years by region in the table below (in thousands):

	Year Ended September 30,
	2018		2017		2016
United States	$	335,743	$	279,352	$	405,298
Canada	42,235		45,540		77,252
Middle East and Africa	38,490		26,639		40,294
Far East	12,976		3,877		7,895
Europe	10,538		21,194		26,200
Mexico, Central and South America	8,734		19,309		8,304
Total revenues	$	448,716	$	395,911	$	565,243

Schedule of Long-Lived Assets by Geographical Areas

	September 30,
	2018		2017
Long-lived assets:
United States	$	76,016	$	82,589
Canada	48,126		52,122
United Kingdom	4,622		4,709
Total	$	128,764	$	139,420