CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of Condensed Consolidating Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012
CURRENT ASSETS
Cash and equivalents	$ 87,437	$ 178,130	$ 126,104	$ 209,654
Accounts receivable, net of allowances	269,669	256,215
Contract costs and recognized income not yet billed, net of progress payments	104,877	109,828
Inventories, net	278,462	230,120
Prepaid and other current assets	74,290	48,903
Assets of discontinued operations	1,209	1,214
Total Current Assets	815,944	824,410
PROPERTY, PLANT AND EQUIPMENT, net	365,376	353,593
GOODWILL	381,315	357,730
INTANGIBLE ASSETS, net	235,092	221,391
INTERCOMPANY RECEIVABLE	0	0
EQUITY INVESTMENTS IN SUBSIDIARIES	0	0
OTHER ASSETS	30,491	28,580
ASSETS OF DISCONTINUED OPERATIONS	3,032	3,075
Total Assets	1,831,250	1,788,779
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	11,886	10,768
Accounts payable and accrued liabilities	284,773	270,353
Liabilities of discontinued operations	2,959	3,288
Total Current Liabilities	299,618	284,409
LONG-TERM DEBT, net of debt discounts	797,180	678,487
INTERCOMPANY PAYABLES	0	0
OTHER LIABILITIES	162,103	170,675
LIABILITIES OF DISCONTINUED OPERATIONS	4,008	4,744
Total Liabilities	1,262,909	1,138,315
Total Shareholders’ Equity	568,341	650,464
Total Liabilities and Shareholders’ Equity	1,831,250	1,788,779
Parent Company [Member]
CURRENT ASSETS
Cash and equivalents	9,208	68,994	35,260	125,093
Accounts receivable, net of allowances	0	0
Contract costs and recognized income not yet billed, net of progress payments	0	0
Inventories, net	0	0
Prepaid and other current assets	21,180	(712)
Assets of discontinued operations	0	0
Total Current Assets	30,388	68,282
PROPERTY, PLANT AND EQUIPMENT, net	1,392	972
GOODWILL	0	0
INTANGIBLE ASSETS, net	0	0
INTERCOMPANY RECEIVABLE	547,665	547,903
EQUITY INVESTMENTS IN SUBSIDIARIES	802,548	772,374
OTHER ASSETS	46,687	45,968
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	1,428,680	1,435,499
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	1,762	1,000
Accounts payable and accrued liabilities	33,353	41,121
Liabilities of discontinued operations	0	0
Total Current Liabilities	35,115	42,121
LONG-TERM DEBT, net of debt discounts	742,289	656,852
INTERCOMPANY PAYABLES	21,450	20,607
OTHER LIABILITIES	61,485	65,455
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	860,339	785,035
Total Shareholders’ Equity	568,341	650,464
Total Liabilities and Shareholders’ Equity	1,428,680	1,435,499
Guarantor Companies [Member]
CURRENT ASSETS
Cash and equivalents	19,500	25,343	23,036	34,782
Accounts receivable, net of allowances	222,754	213,506
Contract costs and recognized income not yet billed, net of progress payments	104,518	109,683
Inventories, net	200,772	173,406
Prepaid and other current assets	23,835	21,854
Assets of discontinued operations	0	0
Total Current Assets	571,379	543,792
PROPERTY, PLANT AND EQUIPMENT, net	261,632	248,973
GOODWILL	288,147	288,146
INTANGIBLE ASSETS, net	157,861	160,349
INTERCOMPANY RECEIVABLE	877,793	911,632
EQUITY INVESTMENTS IN SUBSIDIARIES	682,810	533,742
OTHER ASSETS	51,205	50,423
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	2,890,827	2,737,057
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	1,129	1,079
Accounts payable and accrued liabilities	187,496	183,665
Liabilities of discontinued operations	0	0
Total Current Liabilities	188,625	184,744
LONG-TERM DEBT, net of debt discounts	8,096	9,006
INTERCOMPANY PAYABLES	746,378	796,741
OTHER LIABILITIES	149,029	153,970
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	1,092,128	1,144,461
Total Shareholders’ Equity	1,798,699	1,592,596
Total Liabilities and Shareholders’ Equity	2,890,827	2,737,057
Non-Guarantor Companies [Member]
CURRENT ASSETS
Cash and equivalents	58,729	83,793	67,808	49,779
Accounts receivable, net of allowances	78,918	76,241
Contract costs and recognized income not yet billed, net of progress payments	359	145
Inventories, net	77,550	56,723
Prepaid and other current assets	18,714	17,330
Assets of discontinued operations	1,209	1,214
Total Current Assets	235,479	235,446
PROPERTY, PLANT AND EQUIPMENT, net	102,352	103,648
GOODWILL	93,168	69,584
INTANGIBLE ASSETS, net	77,231	61,042
INTERCOMPANY RECEIVABLE	122,932	573,269
EQUITY INVESTMENTS IN SUBSIDIARIES	1,916,521	2,718,956
OTHER ASSETS	7,812	7,423
ASSETS OF DISCONTINUED OPERATIONS	3,032	3,075
Total Assets	2,558,527	3,772,443
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	8,995	8,689
Accounts payable and accrued liabilities	84,571	70,427
Liabilities of discontinued operations	2,959	3,288
Total Current Liabilities	96,525	82,404
LONG-TERM DEBT, net of debt discounts	46,795	12,629
INTERCOMPANY PAYABLES	733,551	1,188,017
OTHER LIABILITIES	25,921	25,578
LIABILITIES OF DISCONTINUED OPERATIONS	4,008	4,744
Total Liabilities	906,800	1,313,372
Total Shareholders’ Equity	1,651,727	2,459,071
Total Liabilities and Shareholders’ Equity	2,558,527	3,772,443
Elimination [Member]
CURRENT ASSETS
Cash and equivalents	0	0	0	0
Accounts receivable, net of allowances	(32,003)	(33,532)
Contract costs and recognized income not yet billed, net of progress payments	0	0
Inventories, net	140	(9)
Prepaid and other current assets	10,561	10,431
Assets of discontinued operations	0	0
Total Current Assets	(21,302)	(23,110)
PROPERTY, PLANT AND EQUIPMENT, net	0	0
GOODWILL	0	0
INTANGIBLE ASSETS, net	0	0
INTERCOMPANY RECEIVABLE	(1,548,390)	(2,032,804)
EQUITY INVESTMENTS IN SUBSIDIARIES	(3,401,879)	(4,025,072)
OTHER ASSETS	(75,213)	(75,234)
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	(5,046,784)	(6,156,220)
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	0	0
Accounts payable and accrued liabilities	(20,647)	(24,860)
Liabilities of discontinued operations	0	0
Total Current Liabilities	(20,647)	(24,860)
LONG-TERM DEBT, net of debt discounts	0	0
INTERCOMPANY PAYABLES	(1,501,379)	(2,005,365)
OTHER LIABILITIES	(74,332)	(74,328)
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	(1,596,358)	(2,104,553)
Total Shareholders’ Equity	(3,450,426)	(4,051,667)
Total Liabilities and Shareholders’ Equity	$ (5,046,784)	$ (6,156,220)