Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Nov. 30, 2014	Nov. 30, 2013
Cash flows from operating activities:
Net earnings (loss)	$ 35,982us-gaap_ProfitLoss	$ 22,997us-gaap_ProfitLoss
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities:
Deferred income taxes	607us-gaap_DeferredIncomeTaxExpenseBenefit	286us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization	12,050	10,897
Net gain on disposition of equipment	(83)us-gaap_GainLossOnSaleOfOtherAssets	(3,651)us-gaap_GainLossOnSaleOfOtherAssets
Stock based compensation expense	3,411us-gaap_ShareBasedCompensation	1,359us-gaap_ShareBasedCompensation
Noncontrolling interest adjustments	12,952	169
Other	152	358
Decrease (increase) in assets:
Accounts receivable, net	7,806	(19,305)
Inventories	(67,642)us-gaap_IncreaseDecreaseInInventories	(13,178)us-gaap_IncreaseDecreaseInInventories
Leased railcars for syndication	(54,732)	9,853
Other	2,211	2,069
Increase (decrease) in liabilities:
Accounts payable and accrued liabilities	(13,032)	(25,137)
Deferred revenue	6,488	(172)
Net cash provided by (used in) operating activities	(53,830)	(13,455)
Cash flows from investing activities:
Proceeds from sales of assets	2,073	14,051
Capital expenditures	(31,314)	(6,542)
Decrease (increase) in restricted cash	(30)	(168)
Investment in unconsolidated affiliates	(2,500)	(1,253)
Net cash provided by (used in) investing activities	(31,771)	6,088
Cash flows from financing activities:
Net changes in revolving notes with maturities of 90 days or less	15,000
Proceeds from revolving notes with maturities longer than 90 days	23,056	7,474
Repayment of revolving notes with maturities longer than 90 days	(4,610)	(16,878)
Repayments of notes payable	(1,758)us-gaap_RepaymentsOfNotesPayable	(1,223)us-gaap_RepaymentsOfNotesPayable
Decrease in restricted cash	11,000
Investment by joint venture partner		419
Cash distribution to joint venture partner	(2,275)
Excess tax benefit from restricted stock awards	2,970	152
Repurchase of stock	(21,730)	(871)
Net cash provided by (used in) financing activities	21,653	(10,927)
Effect of exchange rate changes	(2,010)	2,085
Increase (decrease) in cash and cash equivalents	(65,958)	(16,209)
Beginning of period	184,916	97,435
End of period	118,958	81,226
Parent
Cash flows from operating activities:
Net earnings (loss)	32,786	15,388
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities:
Deferred income taxes	8,962	4,041
Depreciation and amortization	455	494
Stock based compensation expense	3,411	1,359
Decrease (increase) in assets:
Accounts receivable, net	(108)	36,970
Other	3,259	(60)
Increase (decrease) in liabilities:
Accounts payable and accrued liabilities	27,277	(14,200)
Deferred revenue		(39)
Net cash provided by (used in) operating activities	76,042	43,953
Cash flows from investing activities:
Capital expenditures	(839)	(992)
Investment in unconsolidated affiliates	(87,576)	(25,051)
Net cash provided by (used in) investing activities	(88,415)	(26,043)
Cash flows from financing activities:
Net changes in revolving notes with maturities of 90 days or less	15,000
Intercompany advances	(55,267)	(33,902)
Excess tax benefit from restricted stock awards	2,970	152
Repurchase of stock	(21,730)	(871)
Net cash provided by (used in) financing activities	(59,027)	(34,621)
Increase (decrease) in cash and cash equivalents	(71,400)	(16,711)
Beginning of period	149,747	63,173
End of period	78,347	46,462
Combined Guarantor Subsidiaries
Cash flows from operating activities:
Net earnings (loss)	38,500	15,061
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities:
Deferred income taxes	(8,264)	(2,935)
Depreciation and amortization	6,618	7,519
Net gain on disposition of equipment	(83)	(3,174)
Other		341
Decrease (increase) in assets:
Accounts receivable, net	25,614	91,276
Inventories	(11,166)	(3,997)
Leased railcars for syndication	(67,286)	9,686
Other	977	1,742
Increase (decrease) in liabilities:
Accounts payable and accrued liabilities	(38,790)	(159,156)
Deferred revenue	6,118	(393)
Net cash provided by (used in) operating activities	(47,762)	(44,030)
Cash flows from investing activities:
Proceeds from sales of assets	2,073	13,592
Capital expenditures	(11,845)	(2,608)
Decrease (increase) in restricted cash	(30)	(167)
Investment in unconsolidated affiliates	(4,675)	(797)
Net cash provided by (used in) investing activities	(14,477)	10,020
Cash flows from financing activities:
Intercompany advances	55,477	34,562
Repayments of notes payable	(1,758)	(1,021)
Decrease in restricted cash	11,000
Net cash provided by (used in) financing activities	64,719	33,541
Effect of exchange rate changes	(1,015)	515
Increase (decrease) in cash and cash equivalents	1,465	46
Beginning of period	112	25
End of period	1,577	71
Combined Non-Guarantor Subsidiaries
Cash flows from operating activities:
Net earnings (loss)	38,534	16,759
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities:
Deferred income taxes	(91)	(792)
Depreciation and amortization	5,001	2,905
Net gain on disposition of equipment		(343)
Other	152	17
Decrease (increase) in assets:
Accounts receivable, net	15,362	7,026
Inventories	(56,454)	(9,189)
Other	475	2,060
Increase (decrease) in liabilities:
Accounts payable and accrued liabilities	4,686	(6,231)
Deferred revenue	370	258
Net cash provided by (used in) operating activities	8,035	12,470
Cash flows from investing activities:
Proceeds from sales of assets		459
Capital expenditures	(19,024)	(2,942)
Decrease (increase) in restricted cash		(1)
Investment in unconsolidated affiliates		(1,253)
Net cash provided by (used in) investing activities	(19,024)	(3,737)
Cash flows from financing activities:
Proceeds from revolving notes with maturities longer than 90 days	23,056	7,474
Repayment of revolving notes with maturities longer than 90 days	(4,610)	(16,878)
Intercompany advances	(210)	(660)
Repayments of notes payable		(202)
Investment by joint venture partner		419
Cash distribution to joint venture partner	(2,275)
Net cash provided by (used in) financing activities	15,961	(9,847)
Effect of exchange rate changes	(995)	1,570
Increase (decrease) in cash and cash equivalents	3,977	456
Beginning of period	35,057	34,237
End of period	39,034	34,693
Eliminations
Cash flows from operating activities:
Net earnings (loss)	(73,838)	(24,211)
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities:
Deferred income taxes		(28)
Depreciation and amortization	(24)	(21)
Net gain on disposition of equipment		(134)
Noncontrolling interest adjustments	12,952	169
Decrease (increase) in assets:
Accounts receivable, net	(33,062)	(154,577)
Inventories	(22)	8
Leased railcars for syndication	12,554	167
Other	(2,500)	(1,673)
Increase (decrease) in liabilities:
Accounts payable and accrued liabilities	(6,205)	154,450
Deferred revenue		2
Net cash provided by (used in) operating activities	(90,145)	(25,848)
Cash flows from investing activities:
Capital expenditures	394
Investment in unconsolidated affiliates	89,751	25,848
Net cash provided by (used in) investing activities	$ 90,145	$ 25,848

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