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Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Deferred tax assets:    
Employee benefits $ 7,877 $ 8,920
Inventory 6,469 4,657
Accrued expenses 3,121 2,615
Share-based compensation expense 5,686 5,709
Credit and other carryforwards 9,647 5,803
Lease obligations 6,858 0
Interest rate swap 3,732 8,506
Other 579 1,238
Valuation allowance (2,880) (2,948)
Total deferred tax assets 41,089 34,500
Deferred tax liabilities:    
Depreciation and amortization 94,425 131,237
Lease right-of-use assets 6,689 0
Withholding on transition taxes 4,696 4,156
Other 3,396 3,606
Total deferred tax liabilities $ 109,206 $ 138,999