Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
Feb. 28, 2015	Feb. 28, 2014
Cash flows from operating activities
Net earnings	$ 97,028us-gaap_ProfitLoss	$ 43,550us-gaap_ProfitLoss
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Deferred income taxes	(3,245)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,448)us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization	22,398	20,753
Net gain on disposition of equipment	(204)us-gaap_GainLossOnSaleOfOtherAssets	(9,067)us-gaap_GainLossOnSaleOfOtherAssets
Stock based compensation expense	7,193us-gaap_ShareBasedCompensation	2,862us-gaap_ShareBasedCompensation
Noncontrolling interest adjustments	21,824	2,439
Other	549	329
Decrease (increase) in assets:
Accounts receivable, net	(6,256)	6,900
Inventories	(116,432)us-gaap_IncreaseDecreaseInInventories	9,147us-gaap_IncreaseDecreaseInInventories
Leased railcars for syndication	(75,564)	(13,603)
Other	(355)	68
Increase (decrease) in liabilities:
Accounts payable and accrued liabilities	37,521	(487)
Deferred revenue	7,750	5,377
Net cash provided by (used in) operating activities	(7,793)	66,820
Cash flows from investing activities
Proceeds from sales of assets	3,019	28,671
Capital expenditures	(53,856)	(16,529)
Investment in and advances to unconsolidated affiliates	(5,715)	(1,253)
Decrease (increase) in restricted cash	418	(157)
Other	467
Net cash provided by (used in) investing activities	(55,667)	10,732
Cash flows from financing activities
Net change in revolving notes with maturities of 90 days or less	53,000
Proceeds from revolving notes with maturities longer than 90 days	42,563	31,738
Repayments of revolving notes with maturities longer than 90 days	(18,081)	(53,209)
Repayments of notes payable	(3,740)us-gaap_RepaymentsOfNotesPayable	(2,462)us-gaap_RepaymentsOfNotesPayable
Decrease in restricted cash	11,000
Repurchase of stock	(46,946)	(8,889)
Dividends	(8,016)us-gaap_PaymentsOfDividends
Investment by joint venture partner		419
Cash distribution to joint venture partner	(4,422)	(1,604)
Excess tax benefit from restricted stock awards	3,858	110
Net cash provided by (used in) financing activities	29,216	(33,897)
Effect of exchange rate changes	(5,160)	2,839
Increase (decrease) in cash and cash equivalents	(39,404)	46,494
Cash and cash equivalents
Beginning of period	184,916	97,435
End of period	145,512	143,929
Cash paid during the period for
Interest	7,439us-gaap_InterestPaid	6,610us-gaap_InterestPaid
Income taxes, net	50,570us-gaap_IncomeTaxesPaidNet	29,283us-gaap_IncomeTaxesPaidNet
Non-cash activity
Dividends declared and accrued in Accounts payable and accrued liabilities	157
Transfer from Leased railcars for syndication to Equipment on operating equipment, net	3,313
Capital expenditures accrued in Accounts payable and accrued liabilities	4,451
Transfer of Inventories to Leased railcars for syndication		2,776
Repurchase of stock accrued in Accounts payable and accrued liabilities		$ 1,383

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