CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of Condensed Consolidating Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Sep. 30, 2012
CURRENT ASSETS
Cash and equivalents	$ 42,602	$ 92,405	$ 69,933	$ 178,130	$ 178,130
Accounts receivable, net of allowances	286,452	258,436
Contract costs and recognized income not yet billed, net of progress payments	94,844	109,930
Inventories, net	320,297	290,135
Prepaid and other current assets	44,525	62,569
Assets of discontinued operations	1,638	1,624
Total Current Assets	790,358	815,099
PROPERTY, PLANT AND EQUIPMENT, net	361,200	370,565
GOODWILL	358,695	371,846
INTANGIBLE ASSETS, net	220,811	233,623
INTERCOMPANY RECEIVABLE	0	0
EQUITY INVESTMENTS IN SUBSIDIARIES	0	0
OTHER ASSETS	13,943	13,302
ASSETS OF DISCONTINUED OPERATIONS	2,246	2,126
Total Assets	1,747,253	1,806,561
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	9,162	7,886
Accounts payable and accrued liabilities	266,863	319,995
Liabilities of discontinued operations	2,528	3,282
Total Current Liabilities	278,553	331,163
LONG-TERM DEBT, net of debt discounts	858,315	791,301
INTERCOMPANY PAYABLES	0	0
OTHER LIABILITIES	142,229	148,240
LIABILITIES OF DISCONTINUED OPERATIONS	3,524	3,830
Total Liabilities	1,282,621	1,274,534
Total Shareholders’ Equity	464,632	532,027
Total Liabilities and Shareholders’ Equity	1,747,253	1,806,561
Parent Company [Member]
CURRENT ASSETS
Cash and equivalents	3,174	6,813	4,199		68,994
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	6,691	4,366
Assets of discontinued operations	0	0
Total Current Assets	9,865	11,179
PROPERTY, PLANT AND EQUIPMENT, net	1,230	1,327
GOODWILL	0	0
INTANGIBLE ASSETS, net	0	0
INTERCOMPANY RECEIVABLE	590,476	540,080
EQUITY INVESTMENTS IN SUBSIDIARIES	767,088	780,600
OTHER ASSETS	41,721	27,880
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	1,410,380	1,361,066
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	2,202	2,202
Accounts payable and accrued liabilities	17,305	25,703
Liabilities of discontinued operations	0	0
Total Current Liabilities	19,507	27,905
LONG-TERM DEBT, net of debt discounts	810,754	738,360
INTERCOMPANY PAYABLES	55,663	21,573
OTHER LIABILITIES	59,824	41,201
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	945,748	829,039
Total Shareholders’ Equity	464,632	532,027
Total Liabilities and Shareholders’ Equity	1,410,380	1,361,066
Guarantor Companies [Member]
CURRENT ASSETS
Cash and equivalents	10,803	31,522	25,259		46,357
Accounts receivable, net of allowances	257,607	213,922
Contract costs and recognized income not yet billed, net of progress payments	94,385	109,804
Inventories, net	259,569	219,326
Prepaid and other current assets	22,895	26,319
Assets of discontinued operations	0	0
Total Current Assets	645,259	600,893
PROPERTY, PLANT AND EQUIPMENT, net	272,429	270,519
GOODWILL	284,875	284,875
INTANGIBLE ASSETS, net	154,636	156,772
INTERCOMPANY RECEIVABLE	993,640	892,433
EQUITY INVESTMENTS IN SUBSIDIARIES	641,569	662,403
OTHER ASSETS	50,077	53,896
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	3,042,485	2,921,791
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	1,147	1,144
Accounts payable and accrued liabilities	199,512	227,419
Liabilities of discontinued operations	0	0
Total Current Liabilities	200,659	228,563
LONG-TERM DEBT, net of debt discounts	6,792	7,806
INTERCOMPANY PAYABLES	1,000,772	815,094
OTHER LIABILITIES	158,927	151,674
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	1,367,150	1,203,137
Total Shareholders’ Equity	1,675,335	1,718,654
Total Liabilities and Shareholders’ Equity	3,042,485	2,921,791
Non-Guarantor Companies [Member]
CURRENT ASSETS
Cash and equivalents	28,625	54,070	40,475		62,779
Accounts receivable, net of allowances	62,622	77,218
Contract costs and recognized income not yet billed, net of progress payments	459	126
Inventories, net	60,728	70,537
Prepaid and other current assets	10,742	17,101
Assets of discontinued operations	1,638	1,624
Total Current Assets	164,814	220,676
PROPERTY, PLANT AND EQUIPMENT, net	87,541	98,643
GOODWILL	73,820	86,971
INTANGIBLE ASSETS, net	66,175	76,851
INTERCOMPANY RECEIVABLE	197,273	213,733
EQUITY INVESTMENTS IN SUBSIDIARIES	1,736,265	1,782,406
OTHER ASSETS	9,594	6,739
ASSETS OF DISCONTINUED OPERATIONS	2,246	2,126
Total Assets	2,337,728	2,488,145
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	5,813	4,540
Accounts payable and accrued liabilities	66,422	87,684
Liabilities of discontinued operations	2,528	3,282
Total Current Liabilities	74,763	95,506
LONG-TERM DEBT, net of debt discounts	40,769	45,135
INTERCOMPANY PAYABLES	709,578	762,192
OTHER LIABILITIES	26,622	26,949
LIABILITIES OF DISCONTINUED OPERATIONS	3,524	3,830
Total Liabilities	855,256	933,612
Total Shareholders’ Equity	1,482,472	1,554,533
Total Liabilities and Shareholders’ Equity	2,337,728	2,488,145
Elimination [Member]
CURRENT ASSETS
Cash and equivalents	0	0	0		0
Accounts receivable, net of allowances	(33,777)	(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	4,197	14,783
Assets of discontinued operations	0	0
Total Current Assets	(29,580)	(17,649)
PROPERTY, PLANT AND EQUIPMENT, net	0	76
GOODWILL	0	0
INTANGIBLE ASSETS, net	0	0
INTERCOMPANY RECEIVABLE	(1,781,389)	(1,646,246)
EQUITY INVESTMENTS IN SUBSIDIARIES	(3,144,922)	(3,225,409)
OTHER ASSETS	(87,449)	(75,213)
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	(5,043,340)	(4,964,441)
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	0	0
Accounts payable and accrued liabilities	(16,376)	(20,811)
Liabilities of discontinued operations	0	0
Total Current Liabilities	(16,376)	(20,811)
LONG-TERM DEBT, net of debt discounts	0	0
INTERCOMPANY PAYABLES	(1,766,013)	(1,598,859)
OTHER LIABILITIES	(103,144)	(71,584)
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	(1,885,533)	(1,691,254)
Total Shareholders’ Equity	(3,157,807)	(3,273,187)
Total Liabilities and Shareholders’ Equity	$ (5,043,340)	$ (4,964,441)