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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Income Taxes      
Current income tax provision $ 21,141 $ 18,621 $ 15,383
Deferred provision (benefit):      
Allowance for doubtful accounts 8 34 3
Inventories 139 (80) (88)
Pension accrual (39) (542) (190)
Deferred compensation 250 272 (68)
Loan finance costs 5 5 6
Accruals (270) (95) (90)
Warranty reserve (89) 19 37
Depreciation and amortization (2,714) (2,166) (1,794)
Restricted stock grant (214) (8) 222
Unrepatriated earnings 832 1,338 1,401
Valuation allowance 24    
Foreign amortization (2) (21) (70)
Other accrued expenses (193) (74) 61
Total deferred income tax provision (benefit) (2,263) (1,318) (570)
Total income tax provision $ 18,878 $ 17,303 $ 14,813