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Schedule of Principal Items Comprising Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Jun. 30, 2018
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Income Tax Disclosure [Abstract] |  |
Inventory capitalization | $ 5,687 | $ 5,267
Non-deductible accruals | 1,251 | 1,125
Accrued employee benefits | 9,797 | 7,614
Net-operating loss and credit carryforwards | 54,192 | 48,738
Share-based compensation expense | 7,192 | 7,925
Other | 5,488 | 3,242
Valuation allowances | (16,558) | (21,797)
Total deferred income tax assets | 67,049 | 52,114
Tax over book accumulated depreciation | (28,184) | (24,174)
Intangible assets | (28,202) | (24,649)
Tax on unremitted earnings | (11,662) | (13,090)
Convertible debt | (8,662) | (11,376)
Other | (5,728) | (4,020)
Total deferred income tax liabilities | (82,438) | (77,309)
Net deferred income taxes | $ (15,389) | $ (25,195)

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