Commitments and Contingencies (Details) - USD ($) $ / shares in Units, $ in Millions	Nov. 30, 2016	Aug. 31, 2016	May 01, 2016	Feb. 07, 2016
Other Commitments [Line Items]
Outstanding surety bonds	$ 21
Letters of credit outstanding	$ 28	$ 29
Apollo Merger [Member]
Other Commitments [Line Items]
Cash to be received by shareholders, per share			$ 10.00	$ 10.00