Restatement of Condensed Consolidated Financial Statements (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012
Current assets:
Cash and cash equivalents	$ 166,841	$ 125,343	$ 203,892	$ 212,451	$ 148,605	$ 212,267
Restricted cash	69,028		69,381
Marketable securities			4,055
Accounts receivable - net	403,401		379,002
Recoverable income taxes	17,719		7,885
Inventories - net	53,768		59,746
Deferred income taxes and other current assets	30,844		18,638
Total current assets	741,601		742,599
Long-term contract receivables	16,690		19,021
Long-term capitalized costs	77,560		68,963
Property, plant and equipment - net	64,360		56,305
Deferred income taxes	18,057		19,322
Goodwill	187,595		136,094
Purchased intangibles - net	70,257		57,542
Other assets	11,527		9,772
Total assets	1,187,647		1,109,618
Current liabilities:
Trade accounts payable	23,527		40,310
Customer advances	84,338		84,307
Accrued compensation and other current liabilities	139,856		109,253
Income taxes payable	13,148		12,731
Current portion of long-term debt	591		557
Total current liabilities	269,460		247,158
Long-term debt	102,066		102,363
Other long-term liabilities	43,602		43,017
Shareholders' equity:
Common stock	19,104		15,825
Retained earnings	773,468		740,002			721,333
Accumulated other comprehensive loss	15,812		(2,803)
Treasury stock at cost	(36,078)		(36,078)
Shareholders' equity related to Cubic	772,306		716,946
Noncontrolling interest in variable interest entity	213		134
Total shareholders' equity	772,519		717,080
Total liabilities and shareholders' equity	1,187,647		1,109,618
Previously Reported
Current assets:
Cash and cash equivalents			203,892	212,451	148,605	212,267
Restricted cash			69,381
Marketable securities			4,055
Accounts receivable - net			376,143
Recoverable income taxes			7,885
Inventories - net			54,400
Deferred income taxes and other current assets			18,638
Total current assets			734,394
Long-term contract receivables			19,249
Long-term capitalized costs			75,520
Property, plant and equipment - net			56,305
Deferred income taxes			19,322
Goodwill			136,094
Purchased intangibles - net			57,542
Other assets			9,772
Total assets			1,108,198
Current liabilities:
Trade accounts payable			39,016
Customer advances			103,187
Accrued compensation and other current liabilities			107,330
Income taxes payable			8,076
Current portion of long-term debt			557
Total current liabilities			258,166
Long-term debt			102,363
Other long-term liabilities			42,742
Shareholders' equity:
Common stock			15,825
Retained earnings			728,424			715,043
Accumulated other comprehensive loss			(3,378)
Treasury stock at cost			(36,078)
Shareholders' equity related to Cubic			704,793
Noncontrolling interest in variable interest entity			134
Total shareholders' equity			704,927
Total liabilities and shareholders' equity			1,108,198
Adjustments
Current assets:
Accounts receivable - net			2,859
Inventories - net			5,346
Total current assets			8,205
Long-term contract receivables			(228)
Long-term capitalized costs			(6,557)
Total assets			1,420
Current liabilities:
Trade accounts payable			1,294
Customer advances			(18,880)
Accrued compensation and other current liabilities			1,923
Income taxes payable			4,655
Total current liabilities			(11,008)
Other long-term liabilities			275
Shareholders' equity:
Retained earnings			11,578			6,290
Accumulated other comprehensive loss			575			500
Shareholders' equity related to Cubic			12,153
Total shareholders' equity			12,153
Total liabilities and shareholders' equity			$ 1,420