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Employee Benefit Plans - Amortization Schedule (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Jun. 30, 2014 Retiree Medical Plan | Jun. 30, 2013 Retiree Medical Plan | Jun. 30, 2014 Other Postretirement Benefit Plans, Defined Benefit Plan Established January 1, 2008 [Member] | Jun. 30, 2012 Other Postretirement Benefit Plans, Defined Benefit Plan Established January 1, 2008 [Member] | Jun. 30, 2014 Other Postretirement Benefit Plans, Defined Benefit Plan Established July 1, 2012 [Member] | Jun. 30, 2012 Other Postretirement Benefit Plans, Defined Benefit Plan Established July 1, 2012 [Member] | Jun. 30, 2014 Death Benefit Plan | Jun. 30, 2013 Death Benefit Plan
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit) [Roll Forward] |  |  |  |  |  |  |  |
Net Prior Service Cost (Credit), beginning of period |  | $ (17,477) |  | $ (1,423) |  | $ (16,054) |  |
Annual Amortization | 1,757 |  | 230 |  | 1,527 |  |  |
Years Remaining |  |  | 6 years 2 months 12 days |  | 10 years 6 months |  |  |
Curtailment |  |  | 0 |  | 0 |  |  |
Net Prior Service Cost (Credit), end of period | (15,720) |  | (1,193) | (1,423) | (14,527) | (16,054) |  |
Amortization of Net (Gain) Loss Calculation |  |  |  |  |  |  |  |
Net (gain) loss | (8,006) | (12,087) |  |  |  |  | 1,791 | 1,850
Asset (gains)/losses not yet recognized in market related value of assets | 0 | 0 |  |  |  |  | 0 | 0
Net (gain) loss subject to amortization | (8,006) | (12,087) |  |  |  |  | 1,791 | 1,850
Corridor (10% of greater of APBO or assets) | 1,262 | 872 |  |  |  |  | (826) | (798)
Net (gain)/loss in excess of corridor | $ (6,744) | $ (11,215) |  |  |  |  | $ 965 | $ 1,052
Amortization years | 10 years 8 months 0 days | 11 years 1 month 3 days |  |  |  |  | 7 years 4 months 24 days | 8 years 0 months 15 days

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- Definition Defined Benefit Plan, Accumulated Other Comprehensive Income, Net Gains (Losses) before Market Adjustment, after Tax + References No definition available. + Details
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- Definition Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), Market Adjustment, after Tax + References No definition available. + Details
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- Definition Defined Benefit Plan, Accumulated Other Comprehensive Income, Net Gains (Losses) Subject to Amortization, after Tax + References No definition available. + Details
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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 Defined Benefit Plan, Accumulated Other Comprehensive Income, Net Prior Service Cost (Credit), Remaining Amortization Period + References No definition available. + Details
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- Definition After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise. + References No definition available. + Details
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- Definition Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost. + References No definition available. + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + 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 (h)(7) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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