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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carry-forwards | $ 69,126 | $ 74,548 | $ 36,514
Tax credit carry-forwards | 68,003 | 67,364 | 54,745
Depreciation | 3,113 | 2,755 | 2,168
Intangible amortization | 35,340 | 32,642 | 36,882
Deferred revenue | 11,625 | 7,610 | 1,887
Inventory write-downs | 14,501 | 13,014 | 10,277
Other allowances and accruals | 28,899 | 32,318 | 30,210
Stock based compensation | 2,792 | 3,169 | 4,114
Deferred intercompany gain | 3,693 | 3,693 | 3,693
Ireland goodwill amortization | 6,303 | 7,132 |
Other | 1,175 | 888 | 673
Total deferred tax assets | 244,570 | 245,133 | 181,163
Valuation allowance | (230,588) | (232,862) | (169,343)
Total net deferred tax assets | 13,982 | 12,271 | 11,820
Deferred tax liabilities: |  |  |
Goodwill amortization | (8,575) | (6,691) | (4,904)
Prepaid commissions | (3,166) | (1,958) | (1,585)
Deferred tax liability on foreign withholdings | (578) | (551) | (505)
Total deferred tax liabilities | (12,319) | (9,200) | (6,994)
Net deferred tax assets | 1,663 | 3,071 | 4,826
Recorded as: |  |  |
Net non-current deferred tax assets | 5,491 | 5,405 | 6,783
Net non-current deferred tax liabilities | (3,828) | (2,334) | (1,957)
Net deferred tax assets | $ 1,663 | $ 3,071 | $ 4,826

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