Acquisitions (Details) - USD ($) $ in Thousands				1 Months Ended		3 Months Ended		6 Months Ended		9 Months Ended
	Dec. 16, 2014	Feb. 28, 2014	Nov. 26, 2013	May. 31, 2014	Nov. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
Acquisitions
Net sales						$ 347,806	$ 340,357			$ 1,005,128	$ 1,001,986
Net loss after taxes						(8,786)	(12,216)			(2,937)	(36,765)
Purchase price allocation
Goodwill						239,824		$ 184,141		184,141
Changes in the carrying amount of goodwill
Balance at the beginning of the period								184,141		184,141
Balance at the end of the period						239,824				239,824
Unaudited pro forma information
Net sales						347,800	352,500			1,014,800	1,046,500
Net income attributable to Cubic						8,800	13,800			4,000	37,900
Adjustments made for transaction expenses										0
Transportation Systems
Acquisitions
Net sales						133,300	153,000			411,500	429,100
Cubic Global Defense Services
Acquisitions
Net sales						111,900	91,800			298,400	291,700
Cubic Global Defense Systems
Acquisitions
Net sales						102,600	95,600			295,200	281,200
DTECH LABS, Inc.
Acquisitions
Net sales						10,800				22,600
Net loss after taxes						200				2,000
Transaction and acquisition related costs										800
Cost of acquisition net	$ 99,500
Contingent Amount	15,000
Fair value of consideration transferred	99,400
Cash consideration paid										$ 91,000
Current liability of additional cash consideration to be paid						8,900
Additional cash consideration accelerated if certain event occurs	4,900
Fair value of the potential customer	4,500
Estimated fair value of the liability for contingent consideration						4,400
Purchase price allocation
Cash	900
Deferred tax liabilities	(3,300)
Accounts payable and accrued expenses	(3,300)
Other net assets acquired	200
Net identifiable assets acquired	41,600
Goodwill	57,800
Net assets acquired	99,400
Accounts receivable	5,400
Inventory	4,200
Warranty obligation	(400)
Weighted average useful life of intangible assets										2 years
Estimated amortization expense related to the intangible assets
2015	9,200
2016	8,000
2017	6,800
2018	5,500
2019	4,100
Thereafter	4,300
Changes in the carrying amount of goodwill
Balance at the end of the period	57,800
DTECH LABS, Inc. | Customer relationships
Purchase price allocation
Amortizable intangible assets	35,100
DTECH LABS, Inc. | Non-compete agreements
Purchase price allocation
Amortizable intangible assets	700
DTECH LABS, Inc. | Backlog
Purchase price allocation
Amortizable intangible assets	$ 2,100
Intific Inc.
Acquisitions
Net sales						3,800	1,900			$ 10,600	2,700
Net loss after taxes						300	1,700			1,500	(3,800)
Transaction and acquisition related costs											200
Compensation expense paid											$ 3,700
Fair value of consideration transferred		$ 12,400
Cash consideration paid										$ 11,200
Current liability of additional cash consideration to be paid						1,200
Purchase price allocation
Other intangible assets		200
Deferred tax liabilities		(1,500)
Accounts payable and accrued expenses		(600)
Other net assets acquired		500
Net identifiable assets acquired		5,000
Goodwill		7,400
Net assets acquired		12,400
Accounts receivable		1,500
Deferred tax assets		1,500
Weighted average useful life of intangible assets										2 years
Estimated amortization expense related to the intangible assets
2015		900
2016		700
2017		600
2018		500
2019		200
Thereafter		100
Changes in the carrying amount of goodwill
Balance at the end of the period		7,400
Intific Inc. | Customer relationships
Purchase price allocation
Amortizable intangible assets		2,000
Intific Inc. | Technology
Purchase price allocation
Amortizable intangible assets		700
Intific Inc. | Backlog
Purchase price allocation
Amortizable intangible assets		$ 700
ITMS
Acquisitions
Net sales						10,900	12,800	33,100	$ 30,100
Net loss after taxes						600	$ 500	2,200	$ 200
Transaction and acquisition related costs										$ 500
Fair value of consideration transferred			$ 72,200
Cash consideration paid				$ 3,200	$ 69,000
Purchase price allocation
Accounts receivable - billed			4,400
Accounts receivable - unbilled			6,900
Deferred tax liabilities			(200)
Deferred revenue			(2,600)
Accounts payable and accrued expenses			(4,600)
Other net assets acquired			2,600
Net identifiable assets acquired			31,400
Goodwill			40,800			239,800		184,200		$ 184,200
Net assets acquired			72,200
Weighted average useful life of intangible assets										2 years
Estimated amortization expense related to the intangible assets
2015			5,900
2016			4,900
2017			3,900
2018			2,900
2019			900
Thereafter			100
Changes in the carrying amount of goodwill
Balance at the beginning of the period								184,200		$ 184,200
Acquisitions										57,800
Foreign currency exchange rate changes										(2,200)
Balance at the end of the period			40,800			239,800				239,800
ITMS | Transportation Systems
Purchase price allocation
Goodwill						57,600		59,200		59,200
Changes in the carrying amount of goodwill
Balance at the beginning of the period								59,200		59,200
Foreign currency exchange rate changes										(1,600)
Balance at the end of the period						57,600				57,600
ITMS | Cubic Global Defense Services
Purchase price allocation
Goodwill						94,400		94,400		94,400
Changes in the carrying amount of goodwill
Balance at the beginning of the period								94,400		94,400
Balance at the end of the period						94,400				94,400
ITMS | Cubic Global Defense Systems
Purchase price allocation
Goodwill						87,800		30,600		30,600
Changes in the carrying amount of goodwill
Balance at the beginning of the period								$ 30,600		30,600
Acquisitions										57,800
Foreign currency exchange rate changes										(600)
Balance at the end of the period						$ 87,800				$ 87,800
ITMS | Customer relationships
Purchase price allocation
Amortizable intangible assets			15,700
ITMS | Intellectual property
Purchase price allocation
Amortizable intangible assets			1,600
ITMS | Backlog
Purchase price allocation
Amortizable intangible assets			5,700
ITMS | Supplier relationships
Purchase price allocation
Amortizable intangible assets			600
ITMS | Agreements with Seller
Purchase price allocation
Amortizable intangible assets			$ 1,300