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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Segment Reporting Information [Line Items]
Total operating revenues	$ 132,897	$ 141,319	$ 120,573	$ 121,622	$ 123,540	$ 160,707	$ 141,089	$ 134,845	$ 516,411	$ 560,181	$ 617,933
Operating Income (Loss)									34,375	50,695	78,358
Unallocated general and administrative expenses									(56,419)	(52,261)	(43,228)
Interest and other income (expense), net									(5,087)	(3,944)	297
Earnings before income taxes	11,020	$ 14,065	$ (6,193)	$ 10,396	529	$ 20,423	$ 14,138	$ 11,661	29,288	46,751	78,655
Capital expenditures									11,496	15,244	17,715
Depreciation and amortization									16,881	16,412	14,793
Assets	499,565				536,468				499,565	536,468	526,551
Irrigation [Member]
Segment Reporting Information [Line Items]
Total operating revenues									421,641	451,205	539,943
Capital expenditures									8,375	12,406	14,778
Depreciation and amortization									11,774	11,000	9,125
Assets	341,972				328,036				341,972	328,036	280,031
Infrastructure [Member]
Segment Reporting Information [Line Items]
Total operating revenues									94,770	108,976	77,990
Capital expenditures									2,977	2,671	2,181
Depreciation and amortization									4,648	4,966	5,299
Assets	83,531				81,494				83,531	81,494	96,488
Corporate [Member]
Segment Reporting Information [Line Items]
Capital expenditures									144	167	756
Depreciation and amortization									459	446	369
Assets	$ 74,061				$ 126,938				74,061	126,938	150,033
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									67,767	72,314	95,208
Operating Segments [Member] | Irrigation [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									49,232	52,065	91,697
Operating Segments [Member] | Infrastructure [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									18,535	20,249	3,511
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Unallocated general and administrative expenses									$ (33,392)	$ (21,619)	$ (16,850)

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