Restatement of Condensed Consolidated Financial statements (Details) (USD $)	3 Months Ended	9 Months Ended								12 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Sep. 30, 2010 Revenue Recognition Adjustments	Sep. 30, 2010 Other Adjustments	Sep. 30, 2010 Previously Reported	Sep. 30, 2011 Previously Reported	Jun. 30, 2011 Previously Reported	Mar. 31, 2011 Previously Reported	Sep. 30, 2011 Adjustments
Increase in retained earnings										$ 31,900,000
Decrease in accumulated other comprehensive income										6,600,000
Retained earnings			697,164,000		629,560,000		553,452,000	35,518,000	(3,633,000)	521,567,000	598,849,000			30,711,000
Reclassification [Abstract]
Service cost erroneously classified as product cost	8,900,000	8,900,000
Current assets:
Cash and cash equivalents	312,857,000	312,857,000	231,129,000	230,766,000	329,148,000	250,976,000	295,434,000			295,434,000	329,148,000	312,857,000	250,976,000
Short-term investments					25,829,000						25,829,000
Accounts receivable - net			323,118,000		227,290,000						223,984,000			3,306,000
Recoverable income taxes			15,150,000		24,917,000						20,725,000			4,192,000
Inventories			49,622,000		38,359,000						36,729,000			1,630,000
Deferred income taxes and other current assets			16,708,000		30,563,000						34,230,000			(3,667,000)
Total current assets			704,408,000		676,106,000						670,645,000			5,461,000
Long-term contract receivables			22,850,000		23,700,000						23,700,000
Property, plant and equipment - net			56,166,000		48,467,000						48,467,000
Goodwill			146,597,000		146,355,000						146,355,000
Purchased intangibles			42,836,000		54,139,000						54,139,000
Other assets					17,757,000						15,534,000			2,223,000
Total assets			1,006,687,000		966,524,000						958,840,000			7,684,000
Current liabilities:
Trade accounts payable			40,341,000		43,984,000						38,870,000			5,114,000
Customer advances			127,190,000		134,316,000						183,845,000			(49,529,000)
Accrued compensation and other current liabilities			84,238,000		106,519,000						103,339,000			3,180,000
Income taxes payable			24,778,000		18,716,000						7,902,000			10,814,000
Current portion of long-term debt			4,545,000		4,541,000						4,541,000
Total current liabilities			281,092,000		308,076,000						338,497,000			(30,421,000)
Long-term debt			6,995,000		11,377,000						11,377,000
Other long-term liabilities			67,384,000		67,761,000						57,168,000			10,593,000
Shareholders' equity:
Common stock			12,574,000		12,574,000						12,574,000
Retained earnings			697,164,000		629,560,000		553,452,000	35,518,000	(3,633,000)	521,567,000	598,849,000			30,711,000
Accumulated other comprehensive loss			(22,340,000)		(26,493,000)						(23,294,000)			(3,199,000)
Treasury stock at cost			(36,078,000)		(36,078,000)						(36,078,000)
Shareholders' equity attributable to Cubic			651,320,000		579,563,000						552,051,000			27,512,000
Noncontrolling interest in variable interest entity			(104,000)		(253,000)						(253,000)
Total shareholders' equity			651,216,000		579,310,000						551,798,000			27,512,000
Total liabilities and shareholders' equity			$ 1,006,687,000		$ 966,524,000						$ 958,840,000			$ 7,684,000