Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	May 31, 2018	May 31, 2017	Dec. 31, 2017	May 31, 2018	May 31, 2018	May 31, 2017
Income Tax Disclosure Additional Details [Table] [Line Items]
Earnings before income taxes	$ 25,017	$ 18,482			$ 33,465	$ 25,724
Income tax (benefit) expense	$ (3,995)	$ (4,029)			$ 17,448	$ (6,827)
Effective Income Tax Rate Reconciliation, Percent	(16.00%)	(21.80%)			52.10%	(26.50%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%	21.00%
Effective Income Tax Rate Reconciliation, at Blended Federal Statutory Income Tax Rate					25.70%
Transition Tax					$ 6,100
Change in Income Tax Expense					(13,200)
Provisional Tax Expense Related to Tax Cuts and Jobs Act	$ 12,900				4,500
Change in valuation allowances					2,600
Discrete Income Tax Expense Related to Excess Deferred Tax Deficiencies					1,600
Viking [Domain]
Income Tax Disclosure Additional Details [Table] [Line Items]
Discrete Income Tax Expense					$ 9,400