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Income Taxes - Schedule of Reconciliation of Income Tax Expense at Statutory U.S. Federal Rate to Reported Income Tax Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Taxes at statutory rate |  |  |  |  |  |  |  |  | $ (13,425) | $ 27,051 | $ 34,284
Increase (decrease) in taxes resulting from: |  |  |  |  |  |  |  |  |  |  |
State income taxes-net of federal benefit |  |  |  |  |  |  |  |  | 1,194 | (1,212) | 1,426
Taxes on non U.S. earnings |  |  |  |  |  |  |  |  | (915) | (5,857) | (16,058)
Valuation allowance |  |  |  |  |  |  |  |  | (9,365) | (6,703) | (6,008)
Research and manufacturing incentive deductions and credits |  |  |  |  |  |  |  |  | (15,836) | (11,756) | (7,024)
Stock compensation |  |  |  |  |  |  |  |  | 4,334 | (1,914) | (4,103)
Repatriation tax |  |  |  |  |  |  |  |  | 0 | 14,108 | 36,777
GILTI and FDII |  |  |  |  |  |  |  |  | 36,067 | 6,437 | 0
Impact of U.S. tax rate change on deferred balances |  |  |  |  |  |  |  |  | 0 | 0 | (4,209)
Other |  |  |  |  |  |  |  |  | 1,047 | 1,142 | (893)
Total Income Tax Expense | $ (10,550) | $ 27,417 | $ (9,242) | $ (4,524) | $ 6,701 | $ 2,377 | $ 6,025 | $ 6,193 | $ 3,101 | $ 21,296 | $ 34,192
Taxes at statutory rate |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 28.00%
Increase (decrease) in taxes resulting from: |  |  |  |  |  |  |  |  |  |  |
State income taxes-net of federal benefit, rate |  |  |  |  |  |  |  |  | (2.00%) | (1.00%) | 1.00%
Taxes on non U.S. earnings, rate |  |  |  |  |  |  |  |  | 1.00% | (5.00%) | (13.00%)
Valuation allowance, rate |  |  |  |  |  |  |  |  | 15.00% | (5.00%) | (5.00%)
Research and manufacturing incentive deductions and credits, rate |  |  |  |  |  |  |  |  | 25.00% | (9.00%) | (6.00%)
Stock compensation, rate |  |  |  |  |  |  |  |  | (7.00%) | (1.00%) | (3.00%)
Repatriation tax, rate |  |  |  |  |  |  |  |  | 0.00% | 11.00% | 30.00%
GILTI and FDII, rate |  |  |  |  |  |  |  |  | (56.00%) | 5.00% | 0.00%
Impact of U.S. tax rate change on deferred balances, rate |  |  |  |  |  |  |  |  | 0.00% | 0.00% | (3.00%)
Other, rate |  |  |  |  |  |  |  |  | (2.00%) | 1.00% | (1.00%)
Total Effective Income Tax, rate |  |  |  |  |  |  |  |  | (5.00%) | 17.00% | 28.00%

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