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BUSINESS SEGMENT INFORMATION (Details) (USD $)
3 Months Ended12 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
BUSINESS SEGMENT INFORMATION           
Number of primary business segments        3  
Financial data           
Sales$ 346,910,000$ 319,905,000$ 333,968,000$ 284,420,000$ 347,706,000$ 331,240,000$ 264,559,000$ 250,684,000$ 1,285,203,000.0$ 1,194,189,000$ 1,016,657,000
Operating income30,304,00026,787,00028,045,00027,199,00026,383,00032,636,00026,132,00020,374,000112,335,000105,525,00084,708,000
Assets958,840,000   864,409,000   958,840,000864,409,000756,300,000
Depreciation and amortization        22,341,00014,469,00015,586,000
Expenditures for long-lived assets        8,728,0006,878,0005,332,000
Transportation Systems
           
Financial data           
Sales        415,400,000386,000,000303,400,000
Operating income        56,000,00054,700,00044,100,000
Assets171,500,000   164,500,000   171,500,000164,500,000172,600,000
Depreciation and amortization        3,600,0003,500,0002,400,000
Expenditures for long-lived assets        2,200,0001,800,0001,200,000
Sales to TfL        155,700,000  
MSS and CDS Segments
           
Financial data           
Sales to U.S. government agencies        726,800,000685,000,000592,100,000
Defense Systems
           
Financial data           
Sales        392,700,000362,800,000285,400,000
Operating income        37,900,00028,700,00019,000,000
Assets144,500,000   153,900,000   144,500,000153,900,000157,200,000
Depreciation and amortization        5,400,0004,800,0006,000,000
Expenditures for long-lived assets        5,500,0004,400,0003,300,000
Mission Support Services
           
Financial data           
Sales        475,800,000443,300,000424,400,000
Operating income        24,000,00026,500,00027,900,000
Assets211,600,000   124,000,000   211,600,000124,000,000142,100,000
Depreciation and amortization        12,300,0005,200,0006,200,000
Expenditures for long-lived assets        300,000300,000 
Other
           
Financial data           
Sales        1,300,0002,100,0003,500,000
Unallocated corporate expenses and other
           
Financial data           
Operating income        (5,600,000)(4,400,000)(6,300,000)
Corporate and other
           
Financial data           
Assets431,200,000   422,000,000   431,200,000422,000,000284,400,000
Depreciation and amortization        1,000,0001,000,0001,000,000
Expenditures for long-lived assets        $ 700,000$ 400,000$ 800,000