Note 6. Derivative Instruments (Detail) - Summary of Cash Flow Hedges (USD $) In Thousands, unless otherwise specified	6 Months Ended
Feb. 29, 2012	Feb. 28, 2011
Beginning balance, net of tax	$ 590	$ (238)
Changes in fair value	(998)	3,284
Realized gain reclassified to earnings	(108)	(1,377)
Ending balance, net of tax	$ (516)	$ 1,669

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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Net of tax effect of the reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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- Definition

Change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, net of tax effect. The after tax effect change includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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