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Restatement - Narrative (Details) (USD $) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2013 | Mar. 31, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2010
(Overstatement) understatement of accrued postretirement benefits | $ 22,989,000 |  | $ 22,878,000 |  | $ 22,815,000 |  | $ 22,526,000 |  | $ 19,239,000 |  | $ 19,172,000 |  | $ 19,027,000 |  | $ 22,878,000 |  | $ 19,172,000 |  | $ 22,989,000 |  | $ 19,239,000 |  | $ 16,076,000 | $ 22,526,000 |  | $ 18,996,000 |  |  |
(Overstatement) understatement of other comprehensive income | (1,306,000) |  | (7,157,000) |  | 2,979,000 |  | (36,972,000) |  | (5,211,000) |  | (3,813,000) |  | (7,280,000) |  | (4,178,000) |  | (11,093,000) |  | (5,484,000) |  | (16,304,000) |  | (6,480,000) | (53,150,000) |  | (29,355,000) |  | (31,297,000) |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Overstatement) understatement of accrued postretirement benefits | (12,404,000) | [1] | (12,280,000) | [1] | (12,155,000) | [1] | (12,031,000) | [2] | (5,476,000) | [1] | (5,180,000) | [1] | (4,884,000) | [1] | (12,280,000) | [1] | (5,180,000) | [1] | (12,404,000) | [1] | (5,476,000) | [1] |  | (12,031,000) | [2] | (4,589,000) | [2] |  |
(Overstatement) understatement of other comprehensive income | 109,000 | [3] | 137,000 | [3] | 105,000 | [3] | 8,503,000 | [3] | 290,000 | [3] | 297,000 | [3] | 304,000 | [3] | 242,000 | [3] | 601,000 | [3] | 351,000 | [3] | 891,000 | [3] |  | 9,520,000 | [4] | 9,151,000 | [4],[5] | (2,557,000) | [4],[5]
Retiree Medical Plan | Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Overstatement) understatement of accrued postretirement benefits |  |  |  |  |  |  | (20,700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20,700,000) |  | (11,200,000) |  |  |
(Overstatement) understatement of other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,200,000 | [4] | 11,100,000 | [4] |  |
Death Benefit Plan | Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Overstatement) understatement of accrued postretirement benefits |  |  |  |  |  |  | 8,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,100,000 |  | 6,400,000 |  |  |
(Overstatement) understatement of other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,200,000) | [4] | (800,000) | [4] |  |
Understatement of the Cash Surrender Value of life insurance |  |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200,000 |  | $ 2,100,000 |  |  |
[1] | For details see the introduction section included in Note 2.
[2] | For details see the introduction section included elsewhere in this Note 2.
[3] | See summary table of the impact of the restatement corrections and immaterial adjustments on the consolidated statements of operations and comprehensive income (loss) included in Note 2.
[4] | (1) See summary table of the impact of the restatement corrections and immaterial adjustments on the consolidated statements of operations and comprehensive income (loss) included elsewhere in this Note 2.
[5] | See summary table of the impact of the restatement corrections and immaterial adjustments on the consolidated statements of operations and comprehensive income (loss) included elsewhere in this Note 2.

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6812-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 85-4 -Paragraph 2 -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 change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 30 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A + Details
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