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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017	Aug. 31, 2017
Segment Reporting Information [Line Items]
Total operating revenues	$ 130,339	$ 124,125	$ 254,865	$ 234,515
Total operating income	7,066	8,522	13,267	11,257
Earnings before income taxes	5,676	7,636	10,468	8,971
Capital expenditures	2,724	2,804	4,715	4,194
Depreciation and amortization	4,264	4,085	8,599	8,120
Total Assets	522,354	490,616	522,354	490,616	$ 506,032
Irrigation [Member]
Segment Reporting Information [Line Items]
Capital expenditures	2,362	1,796	4,035	2,746
Depreciation and amortization	2,994	2,880	6,073	5,703
Total Assets	348,298	343,067	348,298	343,067	337,446
Infrastructure [Member]
Segment Reporting Information [Line Items]
Capital expenditures	268	664	464	1,104
Depreciation and amortization	1,144	1,110	2,282	2,219
Total Assets	79,342	73,280	79,342	73,280	80,187
Corporate Segment
Segment Reporting Information [Line Items]
Total operating income	(7,386)	(4,377)	(12,327)	(9,767)
Capital expenditures	94	344	216	344
Depreciation and amortization	126	95	244	198
Total Assets	94,714	74,269	94,714	74,269	$ 88,399
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total operating revenues	130,339	124,125	254,865	234,515
Operating Segments [Member] | Irrigation [Member]
Segment Reporting Information [Line Items]
Total operating revenues	111,865	106,209	215,218	196,061
Total operating income	11,933	11,304	19,784	16,453
Operating Segments [Member] | Infrastructure [Member]
Segment Reporting Information [Line Items]
Total operating revenues	18,474	17,916	39,647	38,454
Total operating income	2,519	1,595	5,810	4,571
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Interest and other expense, net	(1,390)	(886)	(2,799)	(2,286)
Earnings before income taxes	$ 5,676	$ 7,636	$ 10,468	$ 8,971

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