Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	May 31, 2016	Feb. 29, 2016	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Aug. 31, 2014
Accounts Payable and Accrued Liabilities [Line Items]
Trade payables	$ 187,240		$ 263,665
Other accrued liabilities	73,919		64,584
Accrued payroll and related liabilities	61,629		70,836
Accrued maintenance	18,488		18,642
Accrued warranty	12,132	$ 12,147	11,512	$ 10,198	$ 9,188	$ 9,340
Income taxes payable	11,604		22,465
Other	5,640		3,509
Accounts payable and accrued liabilities	$ 370,652		$ 455,213