Description of Business and Summary of Significant Accounting Policies (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of beginning of period	$ 54,620	$ (39,877)
Other comprehensive (loss) income before reclassifications	(51,982)	67,871
Amounts reclassified from AOCI	(22,037)	26,626
Total other comprehensive (loss) income	(74,019)	94,497	$ 10,977
Balance as of end of period	(19,399)	54,620	(39,877)
Amount expected to be reclassified during the next 12 months	9,000
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of beginning of period	57,582	16,338
Other comprehensive (loss) income before reclassifications	(50,151)	35,297
Amounts reclassified from AOCI	0	5,947
Total other comprehensive (loss) income	(50,151)	41,244
Balance as of end of period	7,431	57,582	16,338
Derivative Instruments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of beginning of period	29,967	7,784
Other comprehensive (loss) income before reclassifications	1,225	13,434
Amounts reclassified from AOCI	(23,076)	8,749
Total other comprehensive (loss) income	(21,851)	22,183
Balance as of end of period	8,116	29,967	7,784
Derivative Instruments \| Income Tax Expense
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amounts reclassified from AOCI	(14,800)
Actuarial (Loss) Gain
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of beginning of period	(33,215)	(43,587)
Other comprehensive (loss) income before reclassifications	7,067	8,443
Amounts reclassified from AOCI	1,127	1,929
Total other comprehensive (loss) income	8,194	10,372
Balance as of end of period	(25,021)	(33,215)	(43,587)
Prior Service Cost
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of beginning of period	889	941
Other comprehensive (loss) income before reclassifications	(1,444)	86
Amounts reclassified from AOCI	(88)	(138)
Total other comprehensive (loss) income	(1,532)	(52)
Balance as of end of period	(643)	889	941
Available for Sale Securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of beginning of period	(603)	(21,353)
Other comprehensive (loss) income before reclassifications	(8,679)	10,611
Amounts reclassified from AOCI	0	10,139
Total other comprehensive (loss) income	(8,679)	20,750
Balance as of end of period	$ (9,282)	$ (603)	$ (21,353)

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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