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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, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016	Aug. 31, 2016
Segment Reporting Information [Line Items]
Total operating revenues	$ 124,125	$ 120,573	$ 234,515	$ 242,195
Segment operating income	8,522	(4,694)	11,257	7,054
Unallocated general and administrative expenses	(10,230)	(23,028)	(21,585)	(32,043)
Earnings (loss) before income taxes	7,636	(6,193)	8,971	4,203
Capital expenditures	2,804	2,687	4,194	7,392
Depreciation and amortization	4,085	4,241	8,120	8,536
Assets	490,616	483,270	490,616	483,270	$ 487,515
Irrigation [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1,796	2,054	2,746	5,206
Depreciation and amortization	2,880	2,956	5,703	5,909
Assets	343,067	330,107	343,067	330,107	332,294
Infrastructure [Member]
Segment Reporting Information [Line Items]
Capital expenditures	664	633	1,104	2,186
Depreciation and amortization	1,110	1,177	2,219	2,378
Assets	73,280	76,191	73,280	76,191	81,160
Corporate [Member]
Segment Reporting Information [Line Items]
Capital expenditures	344		344
Depreciation and amortization	95	108	198	249
Assets	74,269	76,972	74,269	76,972	$ 74,061
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total operating revenues	124,125	120,573	234,515	242,195
Segment operating income	12,899	12,613	21,024	28,387
Operating Segments [Member] | Irrigation [Member]
Segment Reporting Information [Line Items]
Total operating revenues	106,209	103,081	196,061	204,407
Segment operating income	11,304	11,081	16,453	23,773
Operating Segments [Member] | Infrastructure [Member]
Segment Reporting Information [Line Items]
Total operating revenues	17,916	17,492	38,454	37,788
Segment operating income	1,595	1,532	4,571	4,614
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Unallocated general and administrative expenses	(4,377)	(17,307)	(9,767)	(21,333)
Interest and other expense, net	(886)	(1,499)	(2,286)	(2,851)
Earnings (loss) before income taxes	$ 7,636	$ (6,193)	$ 8,971	$ 4,203

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