CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated balance sheets - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
CURRENT ASSETS
Cash and equivalents	$ 47,681	$ 72,553	$ 52,001	$ 92,405
Accounts receivable, net of allowances	208,229	184,339
Contract costs and recognized income not yet billed, net of progress payments	131,662	126,961
Inventories, net	299,437	261,317
Prepaid and other current assets	40,067	23,429
Assets of discontinued operations held for sale	370,724	112,139
Assets of discontinued operations not held for sale	329	219
Total Current Assets	1,098,129	780,957
PROPERTY, PLANT AND EQUIPMENT, net	232,135	236,905
GOODWILL	319,139	306,163	304,370
INTANGIBLE ASSETS, net	205,127	197,949
INTERCOMPANY RECEIVABLE	0	0
EQUITY INVESTMENTS IN SUBSIDIARIES	0	0
OTHER ASSETS	16,051	7,569
ASSETS OF DISCONTINUED OPERATIONS HELD FOR SALE	0	250,585
ASSETS OF DISCONTINUED OPERATIONS NOT HELD FOR SALE	2,960	1,968
Total Assets	1,873,541	1,782,096	1,712,813
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	11,078	13,932
Accounts payable and accrued liabilities	267,209	232,189
Liabilities of discontinued operations held for sale	84,450	70,458
Liabilities of discontinued operations not held for sale	8,342	1,684
Total Current Liabilities	371,079	318,263
LONG-TERM DEBT, net of debt discounts	968,080	896,946
INTERCOMPANY PAYABLES	0	0
OTHER LIABILITIES	132,537	123,163
LIABILITIES OF DISCONTINUED OPERATIONS HELD FOR SALE	0	31,071
LIABILITIES OF DISCONTINUED OPERATIONS NOT HELD FOR SALE	3,037	1,706
Total Liabilities	1,474,733	1,371,149
SHAREHOLDERS’ EQUITY	398,808	410,947	430,525	532,027
Total Liabilities and Shareholders’ Equity	1,873,541	1,782,096
Parent Company [Member]
CURRENT ASSETS
Cash and equivalents	3,240	6,517	2,440	6,329
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	21,131	39,763
Assets of discontinued operations held for sale	0	0
Assets of discontinued operations not held for sale	0	0
Total Current Assets	24,371	46,280
PROPERTY, PLANT AND EQUIPMENT, net	645	957
GOODWILL	0	0
INTANGIBLE ASSETS, net	93	92
INTERCOMPANY RECEIVABLE	552,017	539,938
EQUITY INVESTMENTS IN SUBSIDIARIES	863,149	824,889
OTHER ASSETS	12,171	6,436
ASSETS OF DISCONTINUED OPERATIONS HELD FOR SALE	0	0
ASSETS OF DISCONTINUED OPERATIONS NOT HELD FOR SALE	0	0
Total Assets	1,452,446	1,418,592
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	2,854	3,153
Accounts payable and accrued liabilities	14,683	65,750
Liabilities of discontinued operations held for sale	0	0
Liabilities of discontinued operations not held for sale	0	0
Total Current Liabilities	17,537	68,903
LONG-TERM DEBT, net of debt discounts	903,609	848,588
INTERCOMPANY PAYABLES	84,068	57,648
OTHER LIABILITIES	48,424	32,506
LIABILITIES OF DISCONTINUED OPERATIONS HELD FOR SALE	0	0
LIABILITIES OF DISCONTINUED OPERATIONS NOT HELD FOR SALE	0	0
Total Liabilities	1,053,638	1,007,645
SHAREHOLDERS’ EQUITY	398,808	410,947
Total Liabilities and Shareholders’ Equity	1,452,446	1,418,592
Guarantor Subsidiaries [Member]
CURRENT ASSETS
Cash and equivalents	8,066	27,692	10,672	13,835
Accounts receivable, net of allowances	168,731	157,738
Contract costs and recognized income not yet billed, net of progress payments	131,383	126,959
Inventories, net	246,605	217,143
Prepaid and other current assets	15,854	26,744
Assets of discontinued operations held for sale	168,306	45,731
Assets of discontinued operations not held for sale	0	0
Total Current Assets	738,945	602,007
PROPERTY, PLANT AND EQUIPMENT, net	200,362	207,801
GOODWILL	280,797	280,797
INTANGIBLE ASSETS, net	143,415	147,867
INTERCOMPANY RECEIVABLE	757,608	708,093
EQUITY INVESTMENTS IN SUBSIDIARIES	877,641	866,595
OTHER ASSETS	12,054	10,905
ASSETS OF DISCONTINUED OPERATIONS HELD FOR SALE	0	100,094
ASSETS OF DISCONTINUED OPERATIONS NOT HELD FOR SALE	0	0
Total Assets	3,010,822	2,924,159
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	1,471	1,408
Accounts payable and accrued liabilities	199,784	176,912
Liabilities of discontinued operations held for sale	47,426	26,643
Liabilities of discontinued operations not held for sale	0	0
Total Current Liabilities	248,681	204,963
LONG-TERM DEBT, net of debt discounts	6,044	7,366
INTERCOMPANY PAYABLES	1,259,413	732,955
OTHER LIABILITIES	76,036	102,666
LIABILITIES OF DISCONTINUED OPERATIONS HELD FOR SALE	0	23,331
LIABILITIES OF DISCONTINUED OPERATIONS NOT HELD FOR SALE	0	0
Total Liabilities	1,590,174	1,071,281
SHAREHOLDERS’ EQUITY	1,420,648	1,852,878
Total Liabilities and Shareholders’ Equity	3,010,822	2,924,159
Non-Guarantor Subsidiaries [Member]
CURRENT ASSETS
Cash and equivalents	36,375	38,344	38,889	72,241
Accounts receivable, net of allowances	59,929	32,243
Contract costs and recognized income not yet billed, net of progress payments	279	2
Inventories, net	52,759	44,174
Prepaid and other current assets	3,002	5,718
Assets of discontinued operations held for sale	202,418	66,408
Assets of discontinued operations not held for sale	329	219
Total Current Assets	355,091	187,108
PROPERTY, PLANT AND EQUIPMENT, net	31,128	28,147
GOODWILL	38,342	25,366
INTANGIBLE ASSETS, net	61,619	49,990
INTERCOMPANY RECEIVABLE	915,551	307,051
EQUITY INVESTMENTS IN SUBSIDIARIES	1,613,891	1,669,799
OTHER ASSETS	(1,002)	1,314
ASSETS OF DISCONTINUED OPERATIONS HELD FOR SALE	0	150,491
ASSETS OF DISCONTINUED OPERATIONS NOT HELD FOR SALE	2,960	1,968
Total Assets	3,017,580	2,421,234
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	6,753	9,371
Accounts payable and accrued liabilities	46,111	29,212
Liabilities of discontinued operations held for sale	37,024	43,815
Liabilities of discontinued operations not held for sale	8,342	1,684
Total Current Liabilities	98,230	84,082
LONG-TERM DEBT, net of debt discounts	58,427	40,992
INTERCOMPANY PAYABLES	854,518	725,900
OTHER LIABILITIES	14,135	19,777
LIABILITIES OF DISCONTINUED OPERATIONS HELD FOR SALE	0	7,740
LIABILITIES OF DISCONTINUED OPERATIONS NOT HELD FOR SALE	3,037	1,706
Total Liabilities	1,028,347	880,197
SHAREHOLDERS’ EQUITY	1,989,233	1,541,037
Total Liabilities and Shareholders’ Equity	3,017,580	2,421,234
Consolidation, Eliminations [Member]
CURRENT ASSETS
Cash and equivalents	0	0	$ 0	$ 0
Accounts receivable, net of allowances	(20,431)	(5,642)
Contract costs and recognized income not yet billed, net of progress payments	0	0
Inventories, net	73	0
Prepaid and other current assets	80	(48,796)
Assets of discontinued operations held for sale	0	0
Assets of discontinued operations not held for sale	0	0
Total Current Assets	(20,278)	(54,438)
PROPERTY, PLANT AND EQUIPMENT, net	0	0
GOODWILL	0	0
INTANGIBLE ASSETS, net	0	0
INTERCOMPANY RECEIVABLE	(2,225,176)	(1,555,082)
EQUITY INVESTMENTS IN SUBSIDIARIES	(3,354,681)	(3,361,283)
OTHER ASSETS	(7,172)	(11,086)
ASSETS OF DISCONTINUED OPERATIONS HELD FOR SALE	0	0
ASSETS OF DISCONTINUED OPERATIONS NOT HELD FOR SALE	0	0
Total Assets	(5,607,307)	(4,981,889)
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	0	0
Accounts payable and accrued liabilities	6,631	(39,685)
Liabilities of discontinued operations held for sale	0	0
Liabilities of discontinued operations not held for sale	0	0
Total Current Liabilities	6,631	(39,685)
LONG-TERM DEBT, net of debt discounts	0	0
INTERCOMPANY PAYABLES	(2,197,999)	(1,516,503)
OTHER LIABILITIES	(6,058)	(31,786)
LIABILITIES OF DISCONTINUED OPERATIONS HELD FOR SALE	0	0
LIABILITIES OF DISCONTINUED OPERATIONS NOT HELD FOR SALE	0	0
Total Liabilities	(2,197,426)	(1,587,974)
SHAREHOLDERS’ EQUITY	(3,409,881)	(3,393,915)
Total Liabilities and Shareholders’ Equity	$ (5,607,307)	$ (4,981,889)