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Employee Benefit Plans - Amortization Schedule (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Amortization of Net (Gain) Loss Calculation |  |
Amortization years |  | 11 years 10 months 24 days
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 | $ (19,234) |
Annual Amortization | 1,757 |
Net Prior Service Cost (Credit), end of period | (17,477) | (19,234)
Amortization of Net (Gain) Loss Calculation |  |
Net (gain) loss | (12,087) | (3,941)
Asset (gains)/losses not yet recognized in market related value of assets | 0 | 0
Net (gain) loss subject to amortization | (12,087) | (3,941)
Defined Benefit Plan, Corridor | 872 | 1,527
Net (gain)/loss in excess of corridor | (11,215) | (2,414)
Amortization years | 11 years 1 month 3 days |
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 | (1,653) |
Annual Amortization | 230 |
Years Remaining | 7 years 2 months 12 days |
Curtailment | 0 |
Net Prior Service Cost (Credit), end of period | (1,423) |
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 | (17,581) |
Annual Amortization | 1,527 |
Years Remaining | 11 years 6 months |
Curtailment | 0 |
Net Prior Service Cost (Credit), end of period | (16,054) |
Death Benefit Plan |  |
Amortization of Net (Gain) Loss Calculation |  |
Net (gain) loss | 1,850 | 2,231
Asset (gains)/losses not yet recognized in market related value of assets | 0 | 0
Net (gain) loss subject to amortization | 1,850 | 2,231
Defined Benefit Plan, Corridor | (798) | (806)
Net (gain)/loss in excess of corridor | $ 1,052 | $ 1,425
Amortization years | 8 years 0 months 15 days | 8 years 9 months 7 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) 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 related to after tax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components 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=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=21915506&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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 6: 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 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 88 -Paragraph 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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