Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Feb. 28, 2015	Feb. 28, 2014
Cash flows from operating activities:
Net earnings (loss)	$ 97,028us-gaap_ProfitLoss	$ 43,550us-gaap_ProfitLoss
Adjustments to reconcile net earnings (loss) 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 net 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 changes 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
Repayment 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
Beginning of period	184,916	97,435
End of period	145,512	143,929
Parent
Cash flows from operating activities:
Net earnings (loss)	83,137	30,975
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities:
Deferred income taxes	2,846	296
Depreciation and amortization	955	965
Stock based compensation expense	7,193	2,862
Other	43
Decrease (increase) in assets:
Accounts receivable, net	(19)	36,804
Other	1,542	(1,466)
Increase (decrease) in liabilities:
Accounts payable and accrued liabilities	25,397	(19,558)
Deferred revenue		(78)
Net cash provided by (used in) operating activities	121,094	50,800
Cash flows from investing activities:
Capital expenditures	(4,618)	(2,902)
Investment in and net advances to unconsolidated affiliates	(163,337)	(46,396)
Other	467
Net cash provided by (used in) investing activities	(167,488)	(49,298)
Cash flows from financing activities:
Net changes in revolving notes with maturities of 90 days or less	53,000
Repayments of notes payable	(5)
Intercompany advances	(20,716)	55,783
Repurchase of stock	(46,946)	(8,889)
Dividends	(8,016)
Excess tax benefit from restricted stock awards	3,858	110
Net cash provided by (used in) financing activities	(18,825)	47,004
Increase (decrease) in cash and cash equivalents	(65,219)	48,506
Beginning of period	149,747	63,173
End of period	84,528	111,679
Combined Guarantor Subsidiaries
Cash flows from operating activities:
Net earnings (loss)	98,541	35,005
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities:
Deferred income taxes	(8,417)	(1,189)
Depreciation and amortization	13,179	14,113
Net gain on disposition of equipment	(203)	(8,145)
Other	6	313
Decrease (increase) in assets:
Accounts receivable, net	19,260	(76,172)
Inventories	(16,186)	20,361
Leased railcars for syndication	(96,990)	(16,040)
Other	1,726	2,160
Increase (decrease) in liabilities:
Accounts payable and accrued liabilities	(16,725)	62,844
Deferred revenue	8,171	4,697
Net cash provided by (used in) operating activities	2,362	37,947
Cash flows from investing activities:
Proceeds from sales of assets	3,019	27,897
Capital expenditures	(14,709)	(5,101)
Investment in and net advances to unconsolidated affiliates	(15,760)	(2,552)
Decrease (increase) in restricted cash	419	(156)
Net cash provided by (used in) investing activities	(27,031)	20,088
Cash flows from financing activities:
Repayments of notes payable	(3,516)	(2,041)
Intercompany advances	21,269	(56,474)
Decrease in restricted cash	11,000
Net cash provided by (used in) financing activities	28,753	(58,515)
Effect of exchange rate changes	(1,867)	488
Increase (decrease) in cash and cash equivalents	2,217	8
Beginning of period	112	25
End of period	2,329	33
Combined Non-Guarantor Subsidiaries
Cash flows from operating activities:
Net earnings (loss)	89,628	29,365
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities:
Deferred income taxes	2,326	(555)
Depreciation and amortization	8,312	5,717
Net gain on disposition of equipment		(615)
Other	501	17
Decrease (increase) in assets:
Accounts receivable, net	7,687	14,061
Inventories	(100,168)	(11,244)
Other	(6,347)	(557)
Increase (decrease) in liabilities:
Accounts payable and accrued liabilities	41,013	(9,923)
Deferred revenue	(421)	755
Net cash provided by (used in) operating activities	42,531	27,021
Cash flows from investing activities:
Proceeds from sales of assets		774
Capital expenditures	(34,927)	(8,526)
Investment in and net advances to unconsolidated affiliates		(1,253)
Decrease (increase) in restricted cash	(1)	(1)
Net cash provided by (used in) investing activities	(34,928)	(9,006)
Cash flows from financing activities:
Proceeds from revolving notes with maturities longer than 90 days	42,563	31,738
Repayment of revolving notes with maturities longer than 90 days	(18,081)	(53,209)
Repayments of notes payable	(219)	(421)
Intercompany advances	(553)	691
Investment by joint venture partner		419
Cash distribution to joint venture partner	(4,422)	(1,604)
Net cash provided by (used in) financing activities	19,288	(22,386)
Effect of exchange rate changes	(3,293)	2,351
Increase (decrease) in cash and cash equivalents	23,598	(2,020)
Beginning of period	35,057	34,237
End of period	58,655	32,217
Eliminations
Cash flows from operating activities:
Net earnings (loss)	(174,278)	(51,795)
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	(48)	(42)
Net gain on disposition of equipment	(1)	(307)
Noncontrolling interest adjustments	21,824	2,439
Other	(1)	(1)
Decrease (increase) in assets:
Accounts receivable, net	(33,184)	32,207
Inventories	(78)	30
Leased railcars for syndication	21,426	2,437
Other	2,724	(69)
Increase (decrease) in liabilities:
Accounts payable and accrued liabilities	(12,164)	(33,850)
Deferred revenue		3
Net cash provided by (used in) operating activities	(173,780)	(48,948)
Cash flows from investing activities:
Capital expenditures	398
Investment in and net advances to unconsolidated affiliates	173,382	48,948
Net cash provided by (used in) investing activities	$ 173,780	$ 48,948

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

The cash outflow to reacquire common stock during the period.

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The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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- Definition

The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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- Definition

The cash inflow from a borrowing net of the cash outflow from repayment of a borrowing having initial term of repayment within three months.

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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- Definition

The cash inflow from a borrowing having initial term of repayment of more than three months but less than one year or one operating cycle (if the normal cycle is more than one year).

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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- Definition

The cash outflow for a borrowing supported by a written promise to pay an obligation.

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The cash outflow from a repayment of a borrowing having initial term of repayment of more than three months but less than one year or one operating cycle (if the normal cycle is more than one year).

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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