Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Nov. 30, 2016	Aug. 31, 2016	Nov. 30, 2015	Aug. 31, 2015
Accounts Payable and Accrued Liabilities [Line Items]
Trade payables	$ 169,360	$ 182,334
Other accrued liabilities	69,471	71,260
Accrued payroll and related liabilities	59,960	76,058
Accrued maintenance	19,090	18,646
Accrued warranty	11,737	12,159	$ 11,609	$ 11,512
Income taxes payable	10,943	3,991
Other	5,215	5,306
Accounts payable and accrued liabilities	$ 345,776	$ 369,754