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Industry Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012	Aug. 31, 2012
Segment Reporting Information [Line Items]
Total operating revenues	$ 175,539	$ 132,134	$ 322,909	$ 251,339
Segment operating income	33,201	22,064	59,351	30,672
Unallocated general and administrative expenses	(3,755)	(3,116)	(7,641)	(6,641)
Interest and other income (expense), net	42	479	161	(163)
Earnings before income taxes	29,488	19,427	51,871	23,868
Capital Expenditures	3,127	2,091	5,342	4,723
Depreciation and Amortization	3,110	3,110	6,240	6,235
Environmental remediation expenses				7,225
Assets	482,482	393,600	482,482	393,600	415,531
Irrigation [Member]
Segment Reporting Information [Line Items]
Operating revenues	162,677	116,988	296,894	217,764
Segment operating income	35,267	23,019	62,735	32,804
Capital Expenditures	2,965	1,795	5,051	3,831
Depreciation and Amortization	1,692	1,675	3,396	3,345
Environmental remediation expenses				6,141
Assets	371,755	278,569	371,755	278,569	303,741
Infrastructure [Member]
Segment Reporting Information [Line Items]
Operating revenues	12,862	15,146	26,015	33,575
Segment operating income	(2,066)	(955)	(3,384)	(2,132)
Capital Expenditures	162	296	291	892
Depreciation and Amortization	1,418	1,435	2,844	2,890
Environmental remediation expenses				1,084
Assets	$ 110,727	$ 115,031	$ 110,727	$ 115,031	$ 111,790

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Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

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Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.

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