CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated balance sheets - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
CURRENT ASSETS
Cash and equivalents	$ 52,001	$ 92,405	$ 178,130	$ 209,654
Accounts receivable, net of allowances	218,755	258,436
Contract costs and recognized income not yet billed, net of progress payments	103,895	109,930
Inventories, net	325,809	290,135
Prepaid and other current assets	55,086	62,569
Assets of discontinued operations	1,316	1,624
Total Current Assets	756,862	815,099
PROPERTY, PLANT AND EQUIPMENT, net	379,972	370,565
GOODWILL	356,241	374,111	354,459
INTANGIBLE ASSETS, net	213,837	233,623
INTERCOMPANY RECEIVABLE	0	0
EQUITY INVESTMENTS IN SUBSIDIARIES	0	0
OTHER ASSETS	22,346	13,302
ASSETS OF DISCONTINUED OPERATIONS	2,175	2,126
Total Assets	1,731,433	1,808,826	1,777,608
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	16,593	7,886
Accounts payable and accrued liabilities	304,808	322,260
Liabilities of discontinued operations	2,229	3,282
Total Current Liabilities	323,630	333,428
LONG-TERM DEBT, net of debt discounts	826,976	791,301
INTERCOMPANY PAYABLES	0	0
OTHER LIABILITIES	146,923	148,240
LIABILITIES OF DISCONTINUED OPERATIONS	3,379	3,830
Total Liabilities	1,300,908	1,276,799
SHAREHOLDERS’ EQUITY	430,525	532,027	650,464	654,152
Total Liabilities and Shareholders’ Equity	1,731,433	1,808,826
Parent Company [Member]
CURRENT ASSETS
Cash and equivalents	2,440	6,813	68,994	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	23,493	4,366
Assets of discontinued operations	0	0
Total Current Assets	25,933	11,179
PROPERTY, PLANT AND EQUIPMENT, net	1,108	1,327
GOODWILL	0	0
INTANGIBLE ASSETS, net	0	0
INTERCOMPANY RECEIVABLE	542,297	540,080
EQUITY INVESTMENTS IN SUBSIDIARIES	745,262	780,600
OTHER ASSETS	41,774	27,880
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	1,356,374	1,361,066
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	2,202	2,202
Accounts payable and accrued liabilities	30,158	25,703
Liabilities of discontinued operations	0	0
Total Current Liabilities	32,360	27,905
LONG-TERM DEBT, net of debt discounts	752,839	738,360
INTERCOMPANY PAYABLES	76,477	21,573
OTHER LIABILITIES	64,173	41,201
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	925,849	829,039
SHAREHOLDERS’ EQUITY	430,525	532,027
Total Liabilities and Shareholders’ Equity	1,356,374	1,361,066
Guarantor Subsidiaries [Member]
CURRENT ASSETS
Cash and equivalents	10,671	31,522	25,343	34,782
Accounts receivable, net of allowances	178,830	213,922
Contract costs and recognized income not yet billed, net of progress payments	103,879	109,804
Inventories, net	257,929	219,326
Prepaid and other current assets	27,584	26,319
Assets of discontinued operations	0	0
Total Current Assets	578,893	600,893
PROPERTY, PLANT AND EQUIPMENT, net	286,854	270,519
GOODWILL	284,875	283,692
INTANGIBLE ASSETS, net	152,412	156,772
INTERCOMPANY RECEIVABLE	904,840	892,433
EQUITY INVESTMENTS IN SUBSIDIARIES	644,577	662,403
OTHER ASSETS	30,203	53,896
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	2,882,654	2,920,608
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	3,842	1,144
Accounts payable and accrued liabilities	222,758	226,236
Liabilities of discontinued operations	0	0
Total Current Liabilities	226,600	227,380
LONG-TERM DEBT, net of debt discounts	17,116	7,806
INTERCOMPANY PAYABLES	831,345	815,094
OTHER LIABILITIES	126,956	151,674
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	1,202,017	1,201,954
SHAREHOLDERS’ EQUITY	1,680,637	1,718,654
Total Liabilities and Shareholders’ Equity	2,882,654	2,920,608
Non-Guarantor Subsidiaries [Member]
CURRENT ASSETS
Cash and equivalents	38,890	54,070	83,793	49,779
Accounts receivable, net of allowances	61,772	77,218
Contract costs and recognized income not yet billed, net of progress payments	16	126
Inventories, net	67,880	70,537
Prepaid and other current assets	12,488	17,101
Assets of discontinued operations	1,316	1,624
Total Current Assets	182,362	220,676
PROPERTY, PLANT AND EQUIPMENT, net	92,010	98,643
GOODWILL	71,366	90,419
INTANGIBLE ASSETS, net	61,425	76,851
INTERCOMPANY RECEIVABLE	263,480	213,733
EQUITY INVESTMENTS IN SUBSIDIARIES	1,740,889	1,782,406
OTHER ASSETS	9,959	6,739
ASSETS OF DISCONTINUED OPERATIONS	2,175	2,126
Total Assets	2,423,666	2,491,593
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	10,549	4,540
Accounts payable and accrued liabilities	72,843	91,132
Liabilities of discontinued operations	2,229	3,282
Total Current Liabilities	85,621	98,954
LONG-TERM DEBT, net of debt discounts	57,021	45,135
INTERCOMPANY PAYABLES	775,120	762,192
OTHER LIABILITIES	28,428	26,949
LIABILITIES OF DISCONTINUED OPERATIONS	3,379	3,830
Total Liabilities	949,569	937,060
SHAREHOLDERS’ EQUITY	1,474,097	1,554,533
Total Liabilities and Shareholders’ Equity	2,423,666	2,491,593
Elimination [Member]
CURRENT ASSETS
Cash and equivalents	0	0	$ 0	$ 0
Accounts receivable, net of allowances	(21,847)	(32,704)
Contract costs and recognized income not yet billed, net of progress payments	0	0
Inventories, net	0	272
Prepaid and other current assets	(8,479)	14,783
Assets of discontinued operations	0	0
Total Current Assets	(30,326)	(17,649)
PROPERTY, PLANT AND EQUIPMENT, net	0	76
GOODWILL	0	0
INTANGIBLE ASSETS, net	0	0
INTERCOMPANY RECEIVABLE	(1,710,617)	(1,646,246)
EQUITY INVESTMENTS IN SUBSIDIARIES	(3,130,728)	(3,225,409)
OTHER ASSETS	(59,590)	(75,213)
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	(4,931,261)	(4,964,441)
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	0	0
Accounts payable and accrued liabilities	(20,951)	(20,811)
Liabilities of discontinued operations	0	0
Total Current Liabilities	(20,951)	(20,811)
LONG-TERM DEBT, net of debt discounts	0	0
INTERCOMPANY PAYABLES	(1,682,942)	(1,598,859)
OTHER LIABILITIES	(72,634)	(71,584)
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	(1,776,527)	(1,691,254)
SHAREHOLDERS’ EQUITY	(3,154,734)	(3,273,187)
Total Liabilities and Shareholders’ Equity	$ (4,931,261)	$ (4,964,441)