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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
Jul. 31, 2020
Jul. 31, 2019
Deferred tax assets:    
Accrued expenses $ 4,244 $ 4,175
Inventories 6,256 5,408
Accounts receivable 693 593
Other long-term liabilities 110 211
Stock-based compensation 3,691 3,586
Capital investment 426 426
Tax credits 2,421 0
Domestic NOLs 2,705 137
Foreign NOLs 11,158 10,284
Subtotal 31,704 24,820
Valuation allowance (8,163) (5,701)
Deferred tax assets, net of valuation allowance 23,541 19,119
Deferred tax liabilities:    
Property and equipment (22,790) (11,342)
Intangible assets (21,286) (21,156)
Goodwill (15,021) (11,618)
Convertible debt discount (9,190) 0
Deferred tax liabilities, gross (68,287) (44,116)
Deferred income taxes (assets) 4,787 4,281
Deferred income taxes (liabilities) (49,533) (29,278)
Net deferred income taxes $ (44,746) $ (24,997)