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Income Taxes Income Taxes (Tables) | 12 Months Ended
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Jun. 30, 2017
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The provision for income taxes consists of the following:
| Year Ended June 30,
| 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |
Federal | $ | 80,752 |  |  | $ | 66,574 |  |  | $ | 70,555 |
State | 9,469 |  |  | 7,571 |  |  | 5,221 |
Deferred: |  |  |  |  |
Federal | 25,756 |  |  | 34,355 |  |  | 28,018 |
State | 5,184 |  |  | 3,169 |  |  | 1,425 |
| $ | 121,161 |  |  | $ | 111,669 |  |  | $ | 105,219 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The tax effects of temporary differences related to deferred taxes shown on the balance sheets were:
| June 30,
| 2017 |  | 2016
Deferred tax assets: |  |  |
Contract and service revenues and costs | $ | 54,908 |  |  | $ | 69,597 |
Expense reserves (bad debts, insurance, franchise tax and vacation) | 14,648 |  |  | 14,770 |
Net operating loss carryforwards | 3,547 |  |  | 3,543 |
Other, net | 2,119 |  |  | 2,090 |
Total gross deferred tax assets | 75,222 |  |  | 90,000 |
Valuation allowance | (357 | ) |  | (608 | )
Net deferred tax assets | 74,865 |  |  | 89,392 |
Deferred tax liabilities: |  |  |
Accelerated tax depreciation | (36,994 | ) |  | (40,857 | )
Accelerated tax amortization | (178,999 | ) |  | (160,719 | )
Contract and service revenues and costs | (78,413 | ) |  | (76,417 | )
Total gross deferred liabilities | (294,406 | ) |  | (277,993 | )
Net deferred tax liability | $ | (219,541 | ) |  | $ | (188,601 | )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The following analysis reconciles the statutory federal income tax rate to the effective income tax rates reflected above:
| Year Ended June 30,
| 2017 |  | 2016 |  | 2015
Computed "expected" tax expense | 35.0 | % |  | 35.0 | % |  | 35.0 | %
Increase (reduction) in taxes resulting from: |  |  |  |  |
State income taxes, net of federal income tax benefits | 2.6 | % |  | 1.9 | % |  | 1.4 | %
Research and development credit | (2.0 | )% |  | (2.5 | )% |  | (1.5 | )%
Domestic production activities deduction | (2.1 | )% |  | (1.9 | )% |  | (2.0 | )%
Tax over book basis in subsidiary stock | — | % |  | (1.7 | )% |  | — | %
Tax effects of share-based payments | (0.7 | )% |  | — | % |  | — | %
Other (net) | 0.2 | % |  | 0.2 | % |  | 0.4 | %
| 33.0 | % |  | 31.0 | % |  | 33.3 | %
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] | A reconciliation of the unrecognized tax benefits for the years ended June 30, 2017 and 2016 follows:
| Unrecognized Tax Benefits
Balance at July 1, 2015 | $ | 7,104 |
Additions for current year tax positions | 1,581 |
Reductions for current year tax positions | (56 | )
Additions for prior year tax positions | 507 |
Reductions for prior year tax positions | (38 | )
Reductions related to expirations of statute of limitations | (1,677 | )
Balance at June 30, 2016 | 7,421 |
Additions for current year tax positions | 1,457 |
Reductions for current year tax positions | — |
Additions for prior year tax positions | 23 |
Reductions for prior year tax positions | (766 | )
Settlements | (1,040 | )
Reductions related to expirations of statute of limitations | (1,646 | )
Balance at June 30, 2017 | $ | 5,449 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of unrecognized tax benefits for which a material change is reasonably possible in the next twelve months, typically including the nature of the uncertainty, the event(s) that could cause a material change, and an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made. An unrecognized tax benefit is the difference between a tax position taken in a tax return and the amounts recognized in the financial statements for which it is more likely than not, based on the technical merits of the position, that the tax position will not be sustained upon examination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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