XML 57 R38.htm IDEA: XBRL DOCUMENT
v3.20.4

Benefit Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Retirement Benefits [Abstract] |
Components of net periodic benefit cost | The following tables 11.1, 11.2, and 11.3 provide the components of aggregate annual net periodic benefit cost for each of the years ended December 31, 2020, 2019, and 2018 and changes in the benefit obligation and the funded status of the pension, supplemental executive retirement and other postretirement benefit plans as recognized in the consolidated balance sheets as of December 31, 2020 and 2019.
Components of net periodic benefit cost
Table | 11.1 |  |  |  |  |  |  |  |  |  |  |  |
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(In thousands) |  | 12/31/2020 |  | 12/31/2019 |  | 12/31/2018 |  | 12/31/2020 |  | 12/31/2019 |  | 12/31/2018
1. Company Service Cost |  | $ | 7,342 |  |  | $ | 8,345 |  |  | $ | 10,530 |  |  | $ | 1,263 |  |  | $ | 1,345 |  |  | $ | 1,160 |
2. Interest Cost |  | 13,036 |  |  | 15,705 |  |  | 15,095 |  |  | 832 |  |  | 1,130 |  |  | 834 |
3. Expected Return on Assets |  | (22,139) |  |  | (19,466) |  |  | (22,250) |  |  | (7,407) |  |  | (5,785) |  |  | (6,359) |
4. Other Adjustments |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Subtotal |  | (1,761) |  |  | 4,584 |  |  | 3,375 |  |  | (5,312) |  |  | (3,310) |  |  | (4,365) |
5. Amortization of: |  |  |  |  |  |  |  |  |  |  |  |
a. Net Transition Obligation/(Asset) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
b. Net Prior Service Cost/(Credit) |  | (247) |  |  | (281) |  |  | (351) |  |  | 51 |  |  | (34) |  |  | (4,104) |
c. Net Losses/(Gains) |  | 6,578 |  |  | 8,412 |  |  | 6,937 |  |  | (783) |  |  | — |  |  | (250) |
Total Amortization |  | 6,331 |  |  | 8,131 |  |  | 6,586 |  |  | (732) |  |  | (34) |  |  | (4,354) |
6. Net Periodic Benefit Cost |  | 4,570 |  |  | 12,715 |  |  | 9,961 |  |  | (6,044) |  |  | (3,344) |  |  | (8,719) |
7. Cost of settlements |  | 10,369 |  |  | 1,933 |  |  | — |  |  | — |  |  | — |  |  | — |
8. Total Expense for Year |  | $ | 14,939 |  |  | $ | 14,648 |  |  | $ | 9,961 |  |  | $ | (6,044) |  |  | $ | (3,344) |  |  | $ | (8,719) |
Development of funded status |
Development of funded status
Table | 11.2 |  |  |  |  |  |  |  |
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(In thousands) |  | 12/31/2020 |  | 12/31/2019 |  | 12/31/2020 |  | 12/31/2019
Actuarial Value of Benefit Obligations |  |  |  |  |  |  |  |
1. Measurement Date |  | 12/31/2020 |  | 12/31/2019 |  | 12/31/2020 |  | 12/31/2019
2. Accumulated Benefit Obligation |  | $ | 423,305 |  |  | $ | 412,939 |  |  | $ | 28,714 |  |  | $ | 27,496 |
Funded Status/Asset (Liability) on the Consolidated Balance Sheet |  |  |  |  |  |  |  |
1. Projected Benefit Obligation |  | $ | (423,713) |  |  | $ | (413,350) |  |  | $ | (28,714) |  |  | $ | (27,496) |
2. Plan Assets at Fair Value |  | 411,245 |  |  | 402,691 |  |  | 119,024 |  |  | 99,590 |
3. Funded Status - Overfunded/Asset |  | N/A |  | N/A |  | $ | 90,310 |  |  | $ | 72,094 |
4. Funded Status - Underfunded/Liability |  | (12,468) |  |  | (10,659) |  |  | N/A |  | N/A
Accumulated other comprehensive (income) loss
Table | 11.3 |  |  |  |  |  |  |  |
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(In thousands) |  | 12/31/2020 |  | 12/31/2019 |  | 12/31/2020 |  | 12/31/2019
1. Net Actuarial (Gain)/Loss |  | $ | 98,899 |  |  | $ | 99,826 |  |  | $ | (30,565) |  |  | $ | (18,005) |
2. Net Prior Service Cost/(Credit) |  | (988) |  |  | (1,237) |  |  | 2,673 |  |  | 2,724 |
3. Net Transition Obligation/(Asset) |  | — |  |  | — |  |  | — |  |  | — |
4. Total at Year End |  | $ | 97,911 |  |  | $ | 98,589 |  |  | $ | (27,892) |  |  | $ | (15,281) |
Change in projected benefit obligation | Table 11.4 shows the changes in the projected benefit obligation for 2020 and 2019.
Change in projected benefit / accumulated benefit
Table | 11.4 |  |  |  |  |  |  |  |
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(In thousands) |  | 12/31/2020 |  | 12/31/2019 |  | 12/31/2020 |  | 12/31/2019
1. Benefit Obligation at Beginning of Year |  | $ | 413,350 |  |  | $ | 376,153 |  |  | $ | 27,496 |  |  | $ | 28,085 |
2. Company Service Cost |  | 7,342 |  |  | 8,345 |  |  | 1,263 |  |  | 1,345 |
3. Interest Cost |  | 13,036 |  |  | 15,705 |  |  | 832 |  |  | 1,130 |
4. Plan Participants' Contributions |  | — |  |  | — |  |  | 425 |  |  | 382 |
5. Net Actuarial (Gain)/Loss |  | 36,196 |  |  | 47,113 |  |  | 660 |  |  | (2,075) |
6. Benefit Payments from Fund (1) |  | (40,260) |  |  | (30,829) |  |  | (1,975) |  |  | (826) |
7. Benefit Payments Directly by Company |  | (5,953) |  |  | (3,105) |  |  | — |  |  | — |
8. Plan Amendments |  | 2 |  |  | (5) |  |  | — |  |  | — |
9. Other Adjustment |  | — |  |  | — |  |  | 13 |  |  | (545) |
10. Settlement (Gain)/Loss |  | — |  |  | (27) |  |  | — |  |  | — |
11. Benefit Obligation at End of Year |  | $ | 423,713 |  |  | $ | 413,350 |  |  | $ | 28,714 |  |  | $ | 27,496 |
(1)Includes lump sum payments of $27.5 million and $18.5 million in 2020 and 2019, respectively, from our pension plan to eligible participants, which were former employees with vested benefits.
Change in plan assets | Tables 11.5 and 11.6 shows the changes in the fair value of the net assets available for plan benefits, and changes in other comprehensive income (loss) during 2020 and 2019.
Change in plan assets
Table | 11.5 |  |  |  |  |  |  |  |
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(In thousands) |  | 12/31/2020 |  | 12/31/2019 |  | 12/31/2020 |  | 12/31/2019
1. Fair Value of Plan Assets at Beginning of Year |  | $ | 402,691 |  |  | $ | 359,719 |  |  | $ | 99,590 |  |  | $ | 77,762 |
2. Company Contributions |  | 12,453 |  |  | 10,205 |  |  | — |  |  | — |
3. Plan Participants' Contributions |  | — |  |  | — |  |  | 425 |  |  | 382 |
4. Benefit Payments from Fund |  | (40,260) |  |  | (30,829) |  |  | (1,975) |  |  | (826) |
5. Benefit Payments paid directly by Company |  | (5,953) |  |  | (3,105) |  |  | — |  |  | — |
6. Actual Return on Assets |  | 42,314 |  |  | 70,262 |  |  | 21,409 |  |  | 22,654 |
7. Other Adjustment |  | — |  |  | (3,561) |  |  | (425) |  |  | (382) |
8. Fair Value of Plan Assets at End of Year |  | $ | 411,245 |  |  | $ | 402,691 |  |  | $ | 119,024 |  |  | $ | 99,590 |
Change in accumulated other comprehensive income (AOCI) |
Change in accumulated other comprehensive income (loss) ("AOCI")
Table | 11.6 |  |  |  |  |  |  |  |
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(In thousands) |  | 12/31/2020 |  | 12/31/2019 |  | 12/31/2020 |  | 12/31/2019
1. AOCI in Prior Year |  | $ | 98,589 |  |  | $ | 108,808 |  |  | $ | (15,281) |  |  | $ | 3,629 |
2. Increase/(Decrease) in AOCI |  |  |  |  |  |  |  |
a. Recognized during year - Prior Service (Cost)/Credit |  | 247 |  |  | 281 |  |  | (51) |  |  | 34 |
b. Recognized during year - Net Actuarial (Losses)/Gains |  | (16,948) |  |  | (8,412) |  |  | 782 |  |  | — |
c. Occurring during year - Prior Service Cost |  | 2 |  |  | (5) |  |  | — |  |  | — |
d. Occurring during year - Net Actuarial Losses/(Gains) |  | 16,021 |  |  | (150) |  |  | (13,342) |  |  | (18,944) |
e. Occurring during year - Net Settlement Losses/(Gains) |  | — |  |  | (1,933) |  |  | — |  |  | — |
3. AOCI in Current Year |  | $ | 97,911 |  |  | $ | 98,589 |  |  | $ | (27,892) |  |  | $ | (15,281) |
Actuarial assumptions | The projected benefit obligations, net periodic benefit costs and accumulated postretirement benefit obligation for the plans were determined using the following weighted average assumptions.
Actuarial assumptions
Table | 11.7 |  |  |  |  |  |  |  |
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
|  | 12/31/2020 |  | 12/31/2019 |  | 12/31/2020 |  | 12/31/2019
Weighted-Average Assumptions Used to Determine |  |  |  |  |  |  |  |
Benefit Obligations at year end |  |  |  |  |  |  |  |
1. Discount Rate |  | 2.75 | % |  | 3.45 | % |  | 2.35 | % |  | 3.20 | %
2. Rate of Compensation Increase |  | 3.00 | % |  | 3.00 | % |  | N/A |  | N/A
3. Cash balance interest crediting rate |  | 2.50 | % |  | 3.20 | % |  | N/A |  | N/A
Weighted-Average Assumptions Used to Determine |  |  |  |  |  |  |  |
Net Periodic Benefit Cost for Year |  |  |  |  |  |  |  |
1. Discount Rate |  | 3.30 | % |  | 4.40 | % |  | 3.20 | % |  | 4.25 | %
2. Expected Long-term Return on Plan Assets |  | 5.75 | % |  | 5.75 | % |  | 7.50 | % |  | 7.50 | %
3. Rate of Compensation Increase |  | 3.00 | % |  | 3.00 | % |  | N/A |  | N/A
Assumed Health Care Cost Trend Rates at year end |  |  |  |  |  |  |  |
1. Health Care Cost Trend Rate Assumed for Next Year |  | N/A |  | N/A |  | 6.00 | % |  | 6.00 | %
2. Rate to Which the Cost Trend Rate is Assumed to Decline (Ultimate Trend Rate) |  | N/A |  | N/A |  | 5.00 | % |  | 5.00 | %
3. Year That the Rate Reaches the Ultimate Trend Rate |  | N/A |  | N/A |  | 2024 |  | 2024
Year-end asset allocations of the plans | The year-end asset allocations of the plans are shown in table 11.8 below.
Plan assets
Table | 11.8 |  |  |  |  |  |  |  |
|  | Pension Plan |  | Other Postretirement Benefits
|  | 12/31/2020 |  | 12/31/2019 |  | 12/31/2020 |  | 12/31/2019
1. Equity Securities |  | 21 | % |  | 23 | % |  | 100 | % |  | 100 | %
2. Debt Securities |  | 79 | % |  | 77 | % |  | — | % |  | — | %
3. Total |  | 100 | % |  | 100 | % |  | 100 | % |  | 100 | %
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |
Schedule of investment allocation strategies | The equity investments use combinations of mutual funds, ETFs, and pooled equity account structures focused on the following strategies:
Strategy |  | Objective |  | Investment types
Return seeking growth |  | Funded ratio improvement over the long term |  | ● | Global quality growth
|  | ● | Global low volatility
Return seeking bridge |  | Downside protection in the event of a declining equity market |  | ● | Enduring asset
|  | ● | Durable company
Minimum and maximum allocation ranges for fixed income securities and equity securities | The primary focus in developing asset allocation ranges for the portfolio is the assessment of the portfolio's investment objectives and the level of risk that is acceptable to obtain those objectives. To achieve these objectives the minimum and maximum allocation ranges for fixed income securities and equity securities are:
| Minimum |  | Maximum
Equities (long only) | 70 | % |  | 100 | %
Real estate | 0 | % |  | 15 | %
Commodities | 0 | % |  | 10 | %
Fixed income/Cash | 0 | % |  | 10 | %
Actual and estimated future contributions and actual and estimated future benefit payments | Tables 11.12 and 11.13 show the current and estimated future contributions and benefit payments.
Company contributions
Table | 11.12 |  |  |  |
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(In thousands) |  | 12/31/2020 |  | 12/31/2020
Company Contributions for the Year Ending: |  |  |  |
1. Current |  | $ | 12,453 |  |  | $ | — |
2. Current + 1 |  | 6,200 |  |  | — |
Benefits payments - total
Table | 11.13 |  |  |  |
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(In thousands) |  | 12/31/2020 |  | 12/31/2020
Actual Benefit Payments for the Year Ending: |  |  |  |
1. Current |  | $ | 46,213 |  |  | $ | 1,975 |
Expected Benefit Payments for the Year Ending: |  |  |  |
2. Current + 1 |  | 30,082 |  |  | 1,765 |
3. Current + 2 |  | 29,929 |  |  | 1,995 |
4. Current + 3 |  | 30,076 |  |  | 2,157 |
5. Current + 4 |  | 29,567 |  |  | 2,241 |
6. Current + 5 |  | 28,852 |  |  | 2,357 |
7. Current + 6 - 10 |  | 135,830 |  |  | 10,916 |
Pension Plan |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |
Fair value of plan assets | Tables 11.9a and 11.9b set forth by level, within the fair value hierarchy, the pension plan assets and related accrued investment income at fair value as of December 31, 2020 and 2019. There were no securities that used Level 3 inputs.
Pension plan assets at fair value as of December 31, 2020
Table | 11.9a |  |  |  |  |  |
(In thousands) |  | Level 1 |  | Level 2 |  | Total
Domestic Mutual Funds |  | $ | 4,842 |  |  | $ | — |  |  | $ | 4,842 |
Corporate Bonds |  | — |  |  | 231,190 |  |  | 231,190 |
U.S. Government Securities |  | 26,407 |  |  | — |  |  | 26,407 |
Municipal Bonds |  | — |  |  | 32,891 |  |  | 32,891 |
Foreign Bonds |  | — |  |  | 33,368 |  |  | 33,368 |
Pooled Equity Accounts |  | — |  |  | 82,547 |  |  | 82,547 |
Total Assets at fair value |  | $ | 31,249 |  |  | $ | 379,996 |  |  | $ | 411,245 |
Pension plan assets at fair value as of December 31, 2019
Table | 11.9b |  |  |  |  |  |
(In thousands) |  | Level 1 |  | Level 2 |  | Total
Domestic Mutual Funds |  | $ | 7,325 |  |  | $ | — |  |  | $ | 7,325 |
Corporate Bonds |  | — |  |  | 203,684 |  |  | 203,684 |
U.S. Government Securities |  | 32,166 |  |  | 2,511 |  |  | 34,677 |
Municipal Bonds |  | — |  |  | 38,998 |  |  | 38,998 |
Foreign Bonds |  | — |  |  | 34,024 |  |  | 34,024 |
Pooled Equity Accounts |  | — |  |  | 83,983 |  |  | 83,983 |
Total Assets at fair value |  | $ | 39,491 |  |  | $ | 363,200 |  |  | $ | 402,691 |
Other Postretirement Benefit Plan |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |
Fair value of plan assets | Tables 11.10a and 11.10b set forth the other postretirement benefits plan assets at fair value as of December 31, 2020 and 2019. All are Level 1 assets.
Other postretirement benefits plan assets at fair value as of December 31, 2020
Table | 11.10a |  |
(In thousands) |  | Level 1
Domestic Mutual Funds |  | $ | 91,454 |
International Mutual Funds |  | 27,570 |
Total Assets at fair value |  | $ | 119,024 |
Other postretirement benefits plan assets at fair value as of December 31, 2019
Table | 11.10b |  |
(In thousands) |  | Level 1
Domestic Mutual Funds |  | $ | 77,640 |
International Mutual Funds |  | 21,950 |
Total Assets at fair value |  | $ | 99,590 |

X
- Definition Tabular disclosure of actual and estimated future contributions, and actual and estimated future benefit payments to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References No definition available. + Details
Name: | mtg_ActualAndEstimatedFutureContributionsAndActualAndEstimatedFutureBenefitPaymentsTableTextBlock
Namespace Prefix: | mtg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of pension plans and/or other employee benefit plans': 1) actuarial value of benefit obligations; 2) funded status; and 3) accumulated other comprehensive income (loss) recognized as components of net periodic benefit cost, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References No definition available. + Details
Name: | mtg_DevelopmentOfFundedStatusTableTextBlock
Namespace Prefix: | mtg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the targeted minimum and maximum allocation ranges for fixed income securities and equity securities. + References No definition available. + Details
Name: | mtg_MinimumAndMaximumAllocationRangesForFixedIncomeSecuritiesAndEquitySecuritiesTableTextBlock
Namespace Prefix: | mtg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of Investment Allocation Strategies [Table Text Block] + References No definition available. + Details
Name: | mtg_ScheduleofInvestmentAllocationStrategiesTableTextBlock
Namespace Prefix: | mtg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAssumptionsUsedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfChangesInProjectedBenefitObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
Name: | us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |