Geographic Information (Tables)

12 Months Ended

Sep. 30, 2017

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,
	2017		2016		2015
United States	$	279,352	$	405,298	$	474,038
Canada	45,540		77,252		101,191
Middle East and Africa	26,639		40,294		40,557
Europe	21,194		26,200		23,567
Mexico, Central and South America	19,309		8,304		10,479
Far East	3,877		7,895		12,026
Total revenues	$	395,911	$	565,243	$	661,858

Schedule of Long-Lived Assets by Geographical Areas

	September 30,
	2017		2016
Long-lived assets:
United States	$	82,589	$	88,304
Canada	52,122		52,292
United Kingdom	4,709		4,381
Total	$	139,420	$	144,977