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Schedule of Changes in Projected Benefit Obligations and Plan Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Change in projected benefit obligation: |  |  |
Projected benefit obligation, beginning of period | $ 54,094 | $ 42,575 |
Service cost | 3,689 | 2,680 |
Interest cost | 163 | 434 |
Participant contributions | 1,262 | 1,046 |
Benefits received | 1,743 | 1,567 |
Actuarial (gain) loss on obligation | (2,777) | 8,071 |
Currency translation adjustment | 1,344 | (2,279) |
Projected benefit obligation, end of period | 59,518 | 54,094 | $ 42,575
Change in plan assets: |  |  |
Plan assets at fair value, beginning of period | 35,857 | 32,509 |
Actual return on plan assets | 805 | 431 |
Employer contributions | 2,432 | 2,043 |
Participant contributions | 1,262 | 1,046 |
Benefits received | 1,743 | 1,567 |
Currency translation adjustment | 891 | (1,739) |
Plan assets at fair value, end of period | 42,990 | 35,857 | 32,509
Other non-current assets: |  |  |
Deferred tax asset | 3,496 | 3,857 |
Other non-current liabilities: |  |  |
Underfunded pension liability | 16,528 | 18,237 |
Amounts recognized in accumulated other comprehensive income, net of tax: |  |  |
Pension adjustment | (2,514) | 7,031 | $ 2,244
Accumulated benefit obligation, end of period | $ 56,457 | $ 50,772 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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