Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Details)

v3.10.0.1
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