REVENUES (Amount Of Each Financial Statement to apply New Accounting Standard) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Consolidated Balance Sheets
Contract assets		$ 94,082		$ 53,034
Inventories		119,659		135,416
Total current assets		411,919		396,023
Total assets		1,268,211		1,265,122
Contract liabilities		53,251		49,035
Total current liabilities		194,668		200,530
Deferred tax liabilities		61,536
Total liabilities		491,419		505,712
Retained earnings		627,670		606,837
Total shareholders' equity		776,792		759,410
Total liabilities and shareholders' equity		1,268,211		$ 1,265,122
Consolidated Statements of Operations
Net sales		182,597	$ 173,495
Cost of sales		118,908	111,736
Total costs and expenses		159,340	160,694
Earnings before income tax		23,257	12,801
Income tax (benefit) expense		5,940	(21,870)
Net earnings		$ 17,317	$ 34,671
Basic:
Net earnings		$ 0.67	$ 1.34
Diluted:
Net earnings		$ 0.66	$ 1.33
Consolidated Statements of Comprehensive Income
Net earnings		$ 17,317	$ 34,671
Comprehensive income		12,763	35,976
Consolidated Statements of Cash flows
Net earnings		17,317	34,671
Adjustments to reconcile net earnings to net cash provided by operating activities:
Change in assets and liabilities		(7,912)	1,408
Net cash provided by operating activities		8,102	$ 17,797
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Consolidated Balance Sheets
Contract assets	[1]	(41,836)
Inventories		34,697
Total current assets		(7,139)
Total assets		(7,139)
Contract liabilities	[2]	1,423
Total current liabilities		1,423
Deferred tax liabilities		226
Total liabilities		1,423
Retained earnings		(8,562)
Total shareholders' equity		(8,562)
Total liabilities and shareholders' equity		(7,139)
Consolidated Statements of Operations
Net sales		(4,746)
Cost of sales		(4,448)
Total costs and expenses		(4,448)
Earnings before income tax		(297)
Income tax (benefit) expense		(64)
Net earnings		$ (234)
Basic:
Net earnings		$ (0.01)
Diluted:
Net earnings		$ (0.01)
Consolidated Statements of Comprehensive Income
Net earnings		$ (234)
Comprehensive income		(234)
Consolidated Statements of Cash flows
Net earnings		(234)
Adjustments to reconcile net earnings to net cash provided by operating activities:
Change in assets and liabilities		234
Net cash provided by operating activities		0
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Consolidated Balance Sheets
Contract assets	[1]	52,246
Inventories		154,356
Total current assets		404,780
Total assets		1,261,072
Contract liabilities	[2]	54,674
Total current liabilities		196,091
Deferred tax liabilities		61,762
Total liabilities		492,842
Retained earnings		619,108
Total shareholders' equity		768,230
Total liabilities and shareholders' equity		1,261,072
Consolidated Statements of Operations
Net sales		177,851
Cost of sales		114,460
Total costs and expenses		154,892
Earnings before income tax		22,960
Income tax (benefit) expense		5,876
Net earnings		$ 17,083
Basic:
Net earnings		$ 0.66
Diluted:
Net earnings		$ 0.65
Consolidated Statements of Comprehensive Income
Net earnings		$ 17,083
Comprehensive income		12,529
Consolidated Statements of Cash flows
Net earnings		17,083
Adjustments to reconcile net earnings to net cash provided by operating activities:
Change in assets and liabilities		(7,678)
Net cash provided by operating activities		$ 8,102

[1] Previously “cost and estimated earnings on long-term contracts”

[2] Previously “advance payments on long-term contracts” and “current portion of deferred revenue”