Acquisitions (Details) (USD $)	3 Months Ended		0 Months Ended		1 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Feb. 28, 2014	Nov. 26, 2013	May 31, 2014	Nov. 30, 2013	Dec. 16, 2014	Sep. 30, 2014
Acquisitions
Net sales	$ 318,488,000	$ 307,137,000
Net income (loss) after taxes	5,162,000	8,429,000
Purchase price allocation
Goodwill	239,927,000
Changes in the carrying amount of goodwill
Balance at the beginning of the period	184,141,000
Balance at the end of the period	239,927,000
Unaudited pro forma information
Net sales	328,200,000	326,700,000
Net income attributable to Cubic	6,200,000	7,700,000
Adjustments made for transaction expenses	0
Transportation Systems
Acquisitions
Net sales	131,500,000	127,100,000
Mission Support Services
Acquisitions
Net sales	89,000,000	99,200,000
Defense Systems
Acquisitions
Net sales	98,000,000	80,800,000
Intific Inc.
Acquisitions
Net sales	3,400,000
Net income (loss) after taxes	(700,000)
Fair value of consideration transferred			12,400,000
Cash consideration paid	11,200,000
Current liability of additional cash consideration to be paid	1,200,000
Purchase price allocation
Other intangible assets			200,000
Accounts receivable			1,500,000
Deferred tax assets			1,500,000
Accounts payable and accrued expenses			(600,000)
Deferred tax liabilities, net			(1,500,000)
Other net assets acquired			500,000
Net identifiable assets acquired			5,000,000
Net assets acquired			12,400,000
Weighted average useful life of intangible assets	2 years
Estimated amortization expense related to the intangible assets
2015			900,000
2016			700,000
2017			600,000
2018			500,000
2019			200,000
Finite-Lived Intangible Assets, Amortization Expense, after Year Five			100,000
Changes in the carrying amount of goodwill
Balance at the beginning of the period			7,400,000
Intific Inc. | Customer relationships
Purchase price allocation
Amortizable intangible assets			2,000,000
Intific Inc. | Technology
Purchase price allocation
Amortizable intangible assets			700,000
Intific Inc. | Backlog
Purchase price allocation
Amortizable intangible assets			700,000
ITMS
Acquisitions
Net sales	10,000,000	4,700,000
Net income (loss) after taxes	(1,100,000)	(500,000)
Transaction and acquisition related costs		400,000
Fair value of consideration transferred				72,200,000
Cash consideration paid					3,200,000	69,000,000
Purchase price allocation
Accounts receivable - billed				4,400,000
Accounts receivable - unbilled				6,900,000
Accounts payable and accrued expenses				(4,600,000)
Deferred tax liabilities, net				(200,000)
Deferred revenue				(2,600,000)
Other net assets acquired				2,600,000
Net identifiable assets acquired				31,400,000
Goodwill	239,900,000
Net assets acquired				72,200,000
Weighted average useful life of intangible assets	2 years
Estimated amortization expense related to the intangible assets
2015				5,900,000
2016				4,900,000
2017				3,900,000
2018				2,900,000
2019				900,000
Finite-Lived Intangible Assets, Amortization Expense, after Year Five				100,000
Changes in the carrying amount of goodwill
Balance at the beginning of the period	184,200,000			40,800,000
Acquisitions	57,800,000
Foreign currency exchange rate changes	(2,100,000)
Balance at the end of the period	239,900,000
ITMS | Transportation Systems
Purchase price allocation
Goodwill	57,300,000
Changes in the carrying amount of goodwill
Balance at the beginning of the period	59,200,000
Foreign currency exchange rate changes	(1,900,000)
Balance at the end of the period	57,300,000
ITMS | Mission Support Services
Purchase price allocation
Goodwill	94,400,000							94,400,000
Changes in the carrying amount of goodwill
Balance at the beginning of the period								94,400,000
Balance at the end of the period	94,400,000							94,400,000
ITMS | Defense Systems
Purchase price allocation
Goodwill	88,200,000
Changes in the carrying amount of goodwill
Balance at the beginning of the period	30,600,000
Acquisitions	57,800,000
Foreign currency exchange rate changes	(200,000)
Balance at the end of the period	88,200,000
ITMS | Customer relationships
Purchase price allocation
Amortizable intangible assets				15,700,000
ITMS | Intellectual property
Purchase price allocation
Amortizable intangible assets				1,600,000
ITMS | Backlog
Purchase price allocation
Amortizable intangible assets				5,700,000
ITMS | Supplier relationships
Purchase price allocation
Amortizable intangible assets				600,000
ITMS | Agreements with Seller
Purchase price allocation
Amortizable intangible assets				1,300,000
DTECH Labs Inc
Acquisitions
Net sales	1,000,000
Net income (loss) after taxes	(800,000)
Transaction and acquisition related costs	800,000
Cost of acquisition net	99,500,000
Contingent Amount	15,000,000
Fair value of consideration transferred							99,200,000
Cash consideration paid	83,400,000
Current liability of additional cash consideration to be paid	14,900,000
Additional cash consideration accelerated if certain event occurs	11,400,000
Fair value of the potential customer	11,000,000
Estimated fair value of the liability for contingent consideration	3,900,000
Purchase price allocation
Cash	900,000
Accounts receivable	5,400,000
Inventory	4,100,000
Warranty obligation	(400,000)
Accounts payable and accrued expenses	(3,400,000)
Deferred tax liabilities, net	(3,300,000)
Other net assets acquired	200,000
Net identifiable assets acquired	41,400,000
Goodwill	57,800,000
Net assets acquired	99,200,000
Weighted average useful life of intangible assets	2 years
Estimated amortization expense related to the intangible assets
2015	9,200,000
2016	8,000,000
2017	6,800,000
2018	5,500,000
2019	4,100,000
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	4,300,000
Changes in the carrying amount of goodwill
Balance at the end of the period	57,800,000
DTECH Labs Inc | Customer relationships
Purchase price allocation
Amortizable intangible assets	35,100,000
DTECH Labs Inc | Non-compete agreements
Purchase price allocation
Amortizable intangible assets	700,000
DTECH Labs Inc | Backlog
Purchase price allocation
Amortizable intangible assets	$ 2,100,000