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Schedule of Changes in Projected Benefit Obligations and Plan Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Change in projected benefit obligation: |  |  |
Service cost | $ 3,629 | $ 3,766 | $ 3,689
Interest cost | 528 | 424 | 163
Change in plan assets: |  |  |
Employer contributions | 3,000 | 2,700 |
Amounts recognized in accumulated other comprehensive income: |  |  |
Pension adjustment, net of taxes | (6,122) | 2,846 | 2,514
Swiss Plan |  |  |
Change in projected benefit obligation: |  |  |
Projected benefit obligation, beginning of period | 62,554 | 59,518 |
Service cost | 3,629 | 3,766 |
Interest cost | 528 | 424 |
Benefits accumulated, net of benefits paid | 103 | 1,474 |
Plan amendments |  | (4,068) |
Actuarial (gain) loss on obligation | 6,690 | 1,606 |
Participant contributions | 1,557 | 1,415 |
Currency translation adjustment | (1,372) | (1,581) |
Projected benefit obligation, end of period | 73,483 | 62,554 | 59,518
Change in plan assets: |  |  |
Plan assets at fair value, beginning of period | 49,034 | 42,990 |
Actual return on plan assets | 342 | 1,566 |
Employer contributions | 2,965 | 2,731 |
Participant contributions | 1,557 | 1,415 |
Benefits accumulated, net of benefits paid | 103 | 1,474 |
Currency translation adjustment | (1,076) | (1,142) |
Plan assets at fair value, end of period | 52,719 | 49,034 | $ 42,990
Other non-current assets: |  |  |
Deferred tax asset | 4,392 | 2,859 |
Other non-current liabilities: |  |  |
Underfunded pension liability | 20,764 | 13,520 |
Amounts recognized in accumulated other comprehensive income: |  |  |
Pension adjustment, net of taxes | (11,784) | 2,846 |
Accumulated benefit obligation, end of period | $ 69,682 | $ 59,800 |

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