CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of Condensed Consolidating Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
CURRENT ASSETS
Cash and equivalents	$ 45,955	$ 92,405	$ 87,437	$ 178,130	$ 178,130
Accounts receivable, net of allowances	240,189	258,436
Contract costs and recognized income not yet billed, net of progress payments	104,011	109,930
Inventories, net	318,193	290,135
Prepaid and other current assets	46,747	62,569
Assets of discontinued operations	1,625	1,624
Total Current Assets	756,720	815,099
PROPERTY, PLANT AND EQUIPMENT, net	366,364	370,565
GOODWILL	362,745	375,294
INTANGIBLE ASSETS, net	219,653	233,623
INTERCOMPANY RECEIVABLE	0	0
EQUITY INVESTMENTS IN SUBSIDIARIES	0	0
OTHER ASSETS	14,139	13,302
ASSETS OF DISCONTINUED OPERATIONS	2,131	2,126
Total Assets	1,721,752	1,810,009
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	11,771	7,886
Accounts payable and accrued liabilities	274,598	323,443
Liabilities of discontinued operations	2,392	3,282
Total Current Liabilities	288,761	334,611
LONG-TERM DEBT, net of debt discounts	828,699	791,301
INTERCOMPANY PAYABLES	0	0
OTHER LIABILITIES	138,800	148,240
LIABILITIES OF DISCONTINUED OPERATIONS	3,244	3,830
Total Liabilities	1,259,504	1,277,982
Total Shareholders’ Equity	462,248	532,027
Total Liabilities and Shareholders’ Equity	1,721,752	1,810,009
Parent Company [Member]
CURRENT ASSETS
Cash and equivalents	4,736	6,813	9,208		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	11,960	4,366
Assets of discontinued operations	0	0
Total Current Assets	16,696	11,179
PROPERTY, PLANT AND EQUIPMENT, net	1,142	1,327
GOODWILL	0	0
INTANGIBLE ASSETS, net	93	0
INTERCOMPANY RECEIVABLE	587,567	540,080
EQUITY INVESTMENTS IN SUBSIDIARIES	757,858	780,600
OTHER ASSETS	41,319	27,880
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	1,404,675	1,361,066
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	2,203	2,202
Accounts payable and accrued liabilities	33,668	25,703
Liabilities of discontinued operations	0	0
Total Current Liabilities	35,871	27,905
LONG-TERM DEBT, net of debt discounts	781,774	738,360
INTERCOMPANY PAYABLES	60,428	21,573
OTHER LIABILITIES	59,213	41,201
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	937,286	829,039
Total Shareholders’ Equity	467,389	532,027
Total Liabilities and Shareholders’ Equity	1,404,675	1,361,066
Guarantor Companies [Member]
CURRENT ASSETS
Cash and equivalents	12,893	31,522	19,500		25,343
Accounts receivable, net of allowances	214,674	213,922
Contract costs and recognized income not yet billed, net of progress payments	103,860	109,804
Inventories, net	255,192	219,326
Prepaid and other current assets	24,806	26,319
Assets of discontinued operations	0	0
Total Current Assets	611,425	600,893
PROPERTY, PLANT AND EQUIPMENT, net	274,343	270,519
GOODWILL	284,875	284,875
INTANGIBLE ASSETS, net	153,432	156,772
INTERCOMPANY RECEIVABLE	981,607	892,433
EQUITY INVESTMENTS IN SUBSIDIARIES	644,539	662,403
OTHER ASSETS	50,321	53,896
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	3,000,542	2,921,791
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	1,176	1,144
Accounts payable and accrued liabilities	$ 196,298	227,419
Liabilities of discontinued operations		0
Total Current Liabilities	$ 197,474	228,563
LONG-TERM DEBT, net of debt discounts	6,745	7,806
INTERCOMPANY PAYABLES	944,302	815,094
OTHER LIABILITIES	155,397	151,674
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	1,303,918	1,203,137
Total Shareholders’ Equity	1,696,624	1,718,654
Total Liabilities and Shareholders’ Equity	3,000,542	2,921,791
Non-Guarantor Companies [Member]
CURRENT ASSETS
Cash and equivalents	28,326	54,070	58,729		83,793
Accounts receivable, net of allowances	62,298	77,218
Contract costs and recognized income not yet billed, net of progress payments	151	126
Inventories, net	63,001	70,537
Prepaid and other current assets	12,616	17,101
Assets of discontinued operations	1,625	1,624
Total Current Assets	168,017	220,676
PROPERTY, PLANT AND EQUIPMENT, net	90,879	98,643
GOODWILL	77,870	90,419
INTANGIBLE ASSETS, net	66,128	76,851
INTERCOMPANY RECEIVABLE	226,066	213,733
EQUITY INVESTMENTS IN SUBSIDIARIES	1,757,687	1,782,406
OTHER ASSETS	9,948	6,739
ASSETS OF DISCONTINUED OPERATIONS	2,131	2,126
Total Assets	2,398,726	2,491,593
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	8,392	4,540
Accounts payable and accrued liabilities	68,430	91,132
Liabilities of discontinued operations	2,392	3,282
Total Current Liabilities	79,214	98,954
LONG-TERM DEBT, net of debt discounts	40,180	45,135
INTERCOMPANY PAYABLES	742,973	762,192
OTHER LIABILITIES	26,185	26,949
LIABILITIES OF DISCONTINUED OPERATIONS	3,244	3,830
Total Liabilities	891,796	937,060
Total Shareholders’ Equity	1,506,930	1,554,533
Total Liabilities and Shareholders’ Equity	2,398,726	2,491,593
Elimination [Member]
CURRENT ASSETS
Cash and equivalents	0	0	$ 0		$ 0
Accounts receivable, net of allowances	(36,783)	(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	(2,635)	14,783
Assets of discontinued operations	0	0
Total Current Assets	(39,418)	(17,649)
PROPERTY, PLANT AND EQUIPMENT, net	0	76
GOODWILL	0	0
INTANGIBLE ASSETS, net	0	0
INTERCOMPANY RECEIVABLE	(1,795,240)	(1,646,246)
EQUITY INVESTMENTS IN SUBSIDIARIES	(3,160,084)	(3,225,409)
OTHER ASSETS	(87,449)	(75,213)
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	(5,082,191)	(4,964,441)
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	0	0
Accounts payable and accrued liabilities	(23,798)	(20,811)
Liabilities of discontinued operations	0	0
Total Current Liabilities	(23,798)	(20,811)
LONG-TERM DEBT, net of debt discounts	0	0
INTERCOMPANY PAYABLES	(1,747,703)	(1,598,859)
OTHER LIABILITIES	(101,995)	(71,584)
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	(1,873,496)	(1,691,254)
Total Shareholders’ Equity	(3,208,695)	(3,273,187)
Total Liabilities and Shareholders’ Equity	$ (5,082,191)	$ (4,964,441)