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Employee Benefit Plans - Amortization Schedule (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Retiree Medical Plan |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit) [Roll Forward] |  |
Net Prior Service Cost (Credit), beginning of period | $ (12,207) |
Annual Amortization | 1,756 |
Net Prior Service Cost (Credit), end of period | (10,451) | $ (12,207)
Amortization of Net (Gain) Loss Calculation |  |
Net (gain) loss | (10,298) | (8,710)
Net (gain) loss subject to amortization | (10,298) | (8,710)
Corridor (10% of greater of APBO or assets) | 1,214 | 1,724
Net (gain)/loss in excess of corridor | $ (9,084) | $ (6,986)
Amortization years | 9 years 8 months 12 days | 10 years
Other Postretirement Benefit Plans, Defined Benefit Plan Established January 1, 2008 [Member] |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit) [Roll Forward] |  |
Net Prior Service Cost (Credit), beginning of period | $ (732) |
Annual Amortization | $ 230 |
Years Remaining | 2 years 2 months 12 days |
Curtailment | $ 0 |
Net Prior Service Cost (Credit), end of period | (502) | $ (732)
Other Postretirement Benefit Plans, Defined Benefit Plan Established July 1, 2012 [Member] |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit) [Roll Forward] |  |
Net Prior Service Cost (Credit), beginning of period | (11,475) |
Annual Amortization | $ 1,526 |
Years Remaining | 6 years 6 months |
Curtailment | $ 0 |
Net Prior Service Cost (Credit), end of period | (9,949) | (11,475)
Death Benefit Plan |  |
Amortization of Net (Gain) Loss Calculation |  |
Net (gain) loss | 1,523 | 690
Net (gain) loss subject to amortization | 1,523 | 690
Corridor (10% of greater of APBO or assets) | (854) | (729)
Net (gain)/loss in excess of corridor | $ 669 | $ 0
Amortization years | 7 years | 7 years 8 months 12 days

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- Definition Defined Benefit Plan, Accumulated Other Comprehensive Income, Net Gains (Losses) Subject to Amortization, Remaining Amortization Period + References No definition available. + Details
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- Definition Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + 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 (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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