Summary of Geographic Information (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 28, 2016	Nov. 30, 2015	Aug. 31, 2017		Aug. 31, 2016		Aug. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue		$ 611,407	$ 439,161	$ 566,282	$ 552,314	$ 595,190	$ 612,866	$ 669,079	$ 802,389	$ 2,169,164	[1]	$ 2,679,524	[1]	$ 2,605,278	[1]
Assets		2,397,705				1,835,774				2,397,705		1,835,774		1,787,452
UNITED STATES
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	[1]									1,674,517		2,297,501		2,404,266
Assets		1,307,239				955,674				1,307,239		955,674		1,181,751
Foreign
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	[1]									494,647		382,023		201,012
Mexico
Segment Reporting, Revenue Reconciling Item [Line Items]
Assets		791,974				788,878				791,974		788,878		524,724
Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Assets		$ 298,492				$ 91,222				$ 298,492		$ 91,222		$ 80,977

[1] Revenue is presented on the basis of geographic location of customers.