CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of Condensed Consolidating Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
CURRENT ASSETS
Cash and equivalents	$ 49,968	$ 52,001	$ 46,566	$ 92,405
Accounts receivable, net of allowances	205,882	218,755
Contract costs and recognized income not yet billed, net of progress payments	122,923	103,895
Inventories, net	334,462	325,809
Prepaid and other current assets	56,826	55,086
Assets of discontinued operations	1,360	1,316
Total Current Assets	771,421	756,862
PROPERTY, PLANT AND EQUIPMENT, net	376,110	379,972
GOODWILL	356,412	356,241
INTANGIBLE ASSETS, net	211,472	213,837
INTERCOMPANY RECEIVABLE	0	0
EQUITY INVESTMENTS IN SUBSIDIARIES	0	0
OTHER ASSETS	25,198	22,346
ASSETS OF DISCONTINUED OPERATIONS	2,576	2,175
Total Assets	1,743,189	1,731,433
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	15,189	16,593
Accounts payable and accrued liabilities	263,359	304,808
Liabilities of discontinued operations	2,033	2,229
Total Current Liabilities	280,581	323,630
LONG-TERM DEBT, net of debt discounts	886,028	826,976
INTERCOMPANY PAYABLES	0	0
OTHER LIABILITIES	144,567	146,923
LIABILITIES OF DISCONTINUED OPERATIONS	3,634	3,379
Total Liabilities	1,314,810	1,300,908
Total Shareholders’ Equity	428,379	430,525
Total Liabilities and Shareholders’ Equity	1,743,189	1,731,433
Parent Company [Member]
CURRENT ASSETS
Cash and equivalents	3,589	2,440	3,288	6,813
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	20,530	23,493
Assets of discontinued operations	0	0
Total Current Assets	24,119	25,933
PROPERTY, PLANT AND EQUIPMENT, net	1,064	1,108
GOODWILL	0	0
INTANGIBLE ASSETS, net	0	0
INTERCOMPANY RECEIVABLE	575,596	542,297
EQUITY INVESTMENTS IN SUBSIDIARIES	752,342	745,262
OTHER ASSETS	42,072	41,774
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	1,395,193	1,356,374
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	2,202	2,202
Accounts payable and accrued liabilities	33,681	30,158
Liabilities of discontinued operations	0	0
Total Current Liabilities	35,883	32,360
LONG-TERM DEBT, net of debt discounts	813,902	752,839
INTERCOMPANY PAYABLES	58,957	76,477
OTHER LIABILITIES	58,072	64,173
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	966,814	925,849
Total Shareholders’ Equity	428,379	430,525
Total Liabilities and Shareholders’ Equity	1,395,193	1,356,374
Guarantor Companies [Member]
CURRENT ASSETS
Cash and equivalents	12,108	10,671	6,519	31,522
Accounts receivable, net of allowances	173,229	178,830
Contract costs and recognized income not yet billed, net of progress payments	122,655	103,879
Inventories, net	262,064	257,929
Prepaid and other current assets	28,850	27,584
Assets of discontinued operations	0	0
Total Current Assets	598,906	578,893
PROPERTY, PLANT AND EQUIPMENT, net	283,657	286,854
GOODWILL	284,875	284,875
INTANGIBLE ASSETS, net	151,299	152,412
INTERCOMPANY RECEIVABLE	974,449	904,840
EQUITY INVESTMENTS IN SUBSIDIARIES	642,949	644,577
OTHER ASSETS	33,002	30,203
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	2,969,137	2,882,654
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	2,287	3,842
Accounts payable and accrued liabilities	$ 185,267	222,758
Liabilities of discontinued operations		0
Total Current Liabilities	$ 187,554	226,600
LONG-TERM DEBT, net of debt discounts	20,373	17,116
INTERCOMPANY PAYABLES	949,455	831,345
OTHER LIABILITIES	125,825	126,956
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	1,283,207	1,202,017
Total Shareholders’ Equity	1,685,930	1,680,637
Total Liabilities and Shareholders’ Equity	2,969,137	2,882,654
Non-Guarantor Companies [Member]
CURRENT ASSETS
Cash and equivalents	34,271	38,890	36,759	54,070
Accounts receivable, net of allowances	56,542	61,772
Contract costs and recognized income not yet billed, net of progress payments	268	16
Inventories, net	72,398	67,880
Prepaid and other current assets	11,782	12,488
Assets of discontinued operations	1,360	1,316
Total Current Assets	176,621	182,362
PROPERTY, PLANT AND EQUIPMENT, net	91,389	92,010
GOODWILL	71,537	71,366
INTANGIBLE ASSETS, net	60,173	61,425
INTERCOMPANY RECEIVABLE	273,821	263,480
EQUITY INVESTMENTS IN SUBSIDIARIES	1,746,165	1,740,889
OTHER ASSETS	9,444	9,959
ASSETS OF DISCONTINUED OPERATIONS	2,576	2,175
Total Assets	2,431,726	2,423,666
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	10,700	10,549
Accounts payable and accrued liabilities	68,020	72,843
Liabilities of discontinued operations	2,033	2,229
Total Current Liabilities	80,753	85,621
LONG-TERM DEBT, net of debt discounts	51,753	57,021
INTERCOMPANY PAYABLES	787,779	775,120
OTHER LIABILITIES	26,840	28,428
LIABILITIES OF DISCONTINUED OPERATIONS	3,634	3,379
Total Liabilities	950,759	949,569
Total Shareholders’ Equity	1,480,967	1,474,097
Total Liabilities and Shareholders’ Equity	2,431,726	2,423,666
Elimination [Member]
CURRENT ASSETS
Cash and equivalents	0	0	$ 0	$ 0
Accounts receivable, net of allowances	(23,889)	(21,847)
Contract costs and recognized income not yet billed, net of progress payments	0	0
Inventories, net	0	0
Prepaid and other current assets	(4,336)	(8,479)
Assets of discontinued operations	0	0
Total Current Assets	(28,225)	(30,326)
PROPERTY, PLANT AND EQUIPMENT, net	0	0
GOODWILL	0	0
INTANGIBLE ASSETS, net	0	0
INTERCOMPANY RECEIVABLE	(1,823,866)	(1,710,617)
EQUITY INVESTMENTS IN SUBSIDIARIES	(3,141,456)	(3,130,728)
OTHER ASSETS	(59,320)	(59,590)
ASSETS OF DISCONTINUED OPERATIONS	0	0
Total Assets	(5,052,867)	(4,931,261)
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	0	0
Accounts payable and accrued liabilities	(23,609)	(20,951)
Liabilities of discontinued operations	0	0
Total Current Liabilities	(23,609)	(20,951)
LONG-TERM DEBT, net of debt discounts	0	0
INTERCOMPANY PAYABLES	(1,796,191)	(1,682,942)
OTHER LIABILITIES	(66,170)	(72,634)
LIABILITIES OF DISCONTINUED OPERATIONS	0	0
Total Liabilities	(1,885,970)	(1,776,527)
Total Shareholders’ Equity	(3,166,897)	(3,154,734)
Total Liabilities and Shareholders’ Equity	$ (5,052,867)	$ (4,931,261)