CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Activities:
Net income (loss)	$ 8,214	$ 20,344	$ (60,672)	$ (1,039)
Net income (loss) from discontinued operations	(252)	202	203	1,541
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	23,394	15,351	63,758	48,949
Share-based compensation expense	5,412	4,402	15,271	10,760
Change in fair value of contingent consideration	(74)	1,163	(4,552)	1,833
Gain on sale of property, plant and equipment	(40)	(32,563)	(170)	(32,563)
Deferred income taxes	(2,622)	(948)	(14,457)	(6,773)
Loss on extinguishment of debt			16,090	0
Other items	(5,020)		(712)
Changes in operating assets and liabilities, net of effects from acquisitions:	(65,170)	(6,897)	(136,478)	(105,364)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES FROM CONTINUING OPERATIONS	(29,230)	1,054	(103,349)	(82,656)
NET CASH PROVIDED BY OPERATING ACTIVITIES FROM DISCONTINUED OPERATIONS	2,693		2,778
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(26,537)	1,054	(100,571)	(82,656)
Investing Activities:
Acquisition of businesses, net of cash acquired			(234,788)	(395,854)
Proceeds from sale of property, plant and equipment		44,891		44,891
Purchases of property, plant and equipment	(10,741)	(13,114)	(35,802)	(35,291)
Purchase of non-marketable debt and equity securities		(52,997)		(52,997)
Receipt of withheld proceeds from sale of trade receivables			5,521
NET CASH USED IN INVESTING ACTIVITIES	(10,741)	(21,220)	(265,069)	(439,251)
Financing Activities:
Proceeds from short-term borrowings	110,000	168,000	994,500	782,500
Principal payments on short-term borrowings	(170,000)	(146,000)	(913,000)	(551,500)
Debt extinguishment make whole payment			(15,856)
Proceeds from stock issued under employee stock purchase plan			1,169	783
Purchase of common stock			(3,660)	(3,419)
Dividends paid			(4,225)	(4,205)
Contingent consideration payments related to acquisitions of businesses				(820)
Proceeds from equity offering, net				215,832
NET CASH PROVIDED BY FINANCING ACTIVITIES	12,529	39,774	402,329	472,443
Effect of exchange rates on cash	8,634	(1,574)	1,431	(234)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(16,115)	18,034	38,120	(49,698)
Cash, cash equivalents and restricted cash at the beginning of the period	149,856	71,876	95,621	139,608
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT THE END OF THE PERIOD	133,741	89,910	133,741	89,910
Delerrok Inc.
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Change in fair value of contingent consideration	(1,100)		(1,100)
Supplemental disclosure of non-cash investing and financing activities:
Contingent consideration liability incurred with the acquisition			1,600
Trafficware
Supplemental disclosure of non-cash investing and financing activities:
Receivable recognized in connection with the acquisition of net				1,588
GRIDSMART
Supplemental disclosure of non-cash investing and financing activities:
Receivable recognized in connection with the acquisition of net				442
Nuvotronics
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Change in fair value of contingent consideration			(4,200)
Supplemental disclosure of non-cash investing and financing activities:
Contingent consideration liability incurred with the acquisition				5,300
Cubic Corporation Excluding VIE
Financing Activities:
Proceeds from long-term borrowings			450,000
Principal payments on long-term debt	(3,088)		(202,921)
Deferred financing fees		(1,854)	(2,517)	(1,854)
VIE
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Change in fair value of interest rate swap in VIE	6,888		18,370
Financing Activities:
Proceeds from long-term borrowings	174,938	19,841	198,160	35,816
Principal payments on long-term debt	(92,575)		(92,575)
Deferred financing fees	(8,638)	$ (213)	(8,638)	$ (690)
Equity contribution from Boston VIE partner	$ 1,892		$ 1,892