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Revenue Recognition (Schedule of Disaggregation of Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2018	Nov. 30, 2017
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 110,347
Lease revenue	1,604
Operating revenues	111,951	$ 124,526
Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	87,610
Operating revenues	87,610
Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	22,737
Lease revenue	1,604
Operating revenues	24,341
Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	102,333
Point in Time [Member] | Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	81,086
Point in Time [Member] | Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	21,247
Over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	8,014
Over Time [Member] | Irrigation [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	6,524
Over Time [Member] | Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenue from the contracts with customers	$ 1,490

X

- Definition

Amount of direct financing lease revenue.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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