GOODWILL AND PURCHASED INTANGIBLE ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
GOODWILL AND PURCHASED INTANGIBLE ASSETS
Weighted average amortization period of purchased intangible assets									6 years
Amortization expense	$ 4,488	$ 4,362	$ 4,266	$ 3,564	$ 3,471	$ 3,650	$ 3,668	$ 4,039	$ 16,680	$ 14,828	$ 14,681
Purchased intangible assets
Amortized intangible assets, Gross Carrying Amount	120,339				85,705				120,339	85,705
Amortized intangible assets, Accumulated Amortization	(62,797)				(46,331)				(62,797)	(46,331)
Total intangible assets, Net Carrying Amount	57,542	58,517	62,930	54,188	39,374	42,836	46,493	50,147	57,542	39,374
Expected amortization for purchased intangibles for each of the next five years
2014	15,536								15,536
2015	11,890								11,890
2016	8,272								8,272
2017	5,380								5,380
2018	4,389								4,389
Thereafter	12,075								12,075
Total expected amortization for purchased intangibles	57,542								57,542
Contract and program intangibles
Purchased intangible assets
Amortized intangible assets, Gross Carrying Amount	97,424				71,145				97,424	71,145
Amortized intangible assets, Accumulated Amortization	(54,712)				(40,785)				(54,712)	(40,785)
Total intangible assets, Net Carrying Amount	42,712				30,360				42,712	30,360
Other purchased intangibles
Purchased intangible assets
Amortized intangible assets, Gross Carrying Amount	22,915				14,560				22,915	14,560
Amortized intangible assets, Accumulated Amortization	(8,085)				(5,546)				(8,085)	(5,546)
Total intangible assets, Net Carrying Amount	14,830				9,014				14,830	9,014
Transportation Systems
Expected amortization for purchased intangibles for each of the next five years
2014	3,247								3,247
2015	2,961								2,961
2016	2,775								2,775
2017	2,675								2,675
2018	2,570								2,570
Thereafter	5,765								5,765
Total expected amortization for purchased intangibles	19,993								19,993
Defense Systems
Expected amortization for purchased intangibles for each of the next five years
2014	1,869								1,869
2015	1,239								1,239
2016	783								783
2017	253								253
2018	44								44
Total expected amortization for purchased intangibles	4,188								4,188
Mission Support Services
Expected amortization for purchased intangibles for each of the next five years
2014	10,420								10,420
2015	7,690								7,690
2016	4,714								4,714
2017	2,452								2,452
2018	1,775								1,775
Thereafter	6,310								6,310
Total expected amortization for purchased intangibles	$ 33,361								$ 33,361