SELECTED FINANCIAL STATEMENT INFORMATION (Costs and Estimated Earnings on Uncompleted POC Contracts) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Apr. 30, 2018	Oct. 31, 2017
Costs incurred on uncompleted contracts	$ 36,965	$ 29,491
Estimated Earnings	20,980	19,902
Estimated Revenue on Completed Percentage-of-Completion Contracts	57,945	49,393
Billed Contracts Receivable	(44,621)	(41,262)
Billings in Excess of Cost and Estimated Earnings	13,324	8,131
Included in the accompanying Condensed Consolidated Balance Sheets under the following captions:
Accounts receivable, net (costs and estimated earnings in excess of billings)	15,238	9,377
Accrued expenses and other current liabilities (billings in excess of costs and estimated earnings)	(1,914)	(1,246)
Billings in Excess of Cost and Estimated Earnings	$ 13,324	$ 8,131