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Summary of Significant Accounting Policies (Impact on Consolidated Balance Sheet Upon Adoption of ASC 842) (Detail) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Jul. 01, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ 67,282 |  |  | $ 204,202 | $ 208,295 |  |
Investments in marketable securities | 9,229 |  |  | 8,680 | 7,269 |  |
Restricted cash | 3,465 |  |  | 1,022 | 818 |  |
Accounts receivable, net | 93,394 |  |  | 83,560 | 81,990 |  |
Prepaid expenses and other current assets | 45,275 |  |  | 29,313 | 55,158 |  |
Total current assets | 389,929 |  |  | 504,700 | 506,549 |  |
Noncurrent assets: |  |  |  |  |  |  |
Property and equipment, net | 281,975 |  |  | 283,433 | 275,546 |  |
Operating lease assets | 187,520 |  |  | 0 | 0 |  |
Deferred income taxes | 15,588 |  |  | 18,314 | 19,141 |  |
Intangible assets, net | 292,736 |  |  | 297,989 | 238,613 |  |
Goodwill | 686,805 |  |  | 687,256 | 627,594 |  |
Other assets, net | 82,850 |  |  | 52,113 | 57,743 |  |
Total noncurrent assets | 2,000,681 |  |  | 1,737,996 | 1,615,674 |  |
Total assets | 2,390,610 |  |  | 2,242,696 | 2,122,223 |  |
Current liabilities: |  |  |  |  |  |  |
Accounts payable | 31,457 |  |  | 53,385 | 46,442 |  |
Accrued salaries, wages and benefits | 39,088 |  |  | 46,664 | 42,782 |  |
Accrued liabilities | 89,507 |  |  | 76,529 | 76,035 |  |
Deferred revenue | 51,413 |  |  | 95,944 | 47,097 |  |
Current operating lease liabilities | 53,029 |  |  | 0 | 0 |  |
Current portion of long-term debt | 3,000 |  |  | 3,000 | 3,000 |  |
Total current liabilities | 304,188 |  |  | 311,631 | 244,310 |  |
Noncurrent liabilities: |  |  |  |  |  |  |
Long-term debt | 412,105 |  |  | 398,094 | 289,084 |  |
Long-term operating lease liabilities | 180,002 |  |  | 0 | 0 |  |
Deferred income taxes | 28,845 |  |  | 29,426 | 32,398 |  |
Other liabilities | 91,643 |  |  | 86,326 | 97,329 |  |
Total noncurrent liabilities | 788,428 |  |  | 529,992 | 439,615 |  |
Total liabilities | 1,092,616 |  |  | 841,623 | 683,925 |  |
Redeemable noncontrolling interest | 3,082 | $ 3,187 |  | 9,543 | 8,651 | $ 8,814 | $ 9,110
Shareholders' equity: |  |  |  |  |  |  |
Common Stock, $0.01 Par Value | 806 |  |  | 801 | 801 |  |
Additional paid-in capital | 496,674 |  |  | 486,061 | 479,946 |  |
Retained earnings | 2,032,788 |  |  | 2,012,902 | 1,926,134 |  |
Accumulated other comprehensive loss | (159,118) |  |  | (137,290) | (143,518) |  |
Treasury Stock, at cost | (1,076,238) |  |  | (970,944) | (833,716) |  |
Total shareholders' equity | 1,294,912 | $ 1,327,193 |  | 1,391,530 | 1,429,647 | $ 1,440,035 | $ 1,519,286
Total liabilities and shareholders' equity | $ 2,390,610 |  |  | $ 2,242,696 | $ 2,122,223 |  |
Common Stock, Par Value | $ 0.01 |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
ASC 842 |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 299,445 |  |  |  |
Investments in marketable securities |  |  | 8,680 |  |  |  |
Restricted cash |  |  | 1,022 |  |  |  |
Accounts receivable, net |  |  | 157,829 |  |  |  |
Prepaid expenses and other current assets |  |  | 34,241 |  |  |  |
Total current assets |  |  | 501,217 |  |  |  |
Noncurrent assets: |  |  |  |  |  |  |
Property and equipment, net |  |  | 364,683 |  |  |  |
Operating lease assets |  |  | 282,978 |  |  |  |
Deferred income taxes |  |  | 18,314 |  |  |  |
Intangible assets, net |  |  | 418,097 |  |  |  |
Goodwill |  |  | 874,451 |  |  |  |
Other assets, net |  |  | 62,451 |  |  |  |
Total noncurrent assets |  |  | 2,020,974 |  |  |  |
Total assets |  |  | 2,522,191 |  |  |  |
Current liabilities: |  |  |  |  |  |  |
Accounts payable |  |  | 57,627 |  |  |  |
Accrued salaries, wages and benefits |  |  | 64,492 |  |  |  |
Accrued liabilities |  |  | 69,776 |  |  |  |
Deferred revenue |  |  | 99,790 |  |  |  |
Current operating lease liabilities |  |  | 66,707 |  |  |  |
Current portion of long-term debt |  |  | 3,000 |  |  |  |
Total current liabilities |  |  | 361,392 |  |  |  |
Noncurrent liabilities: |  |  |  |  |  |  |
Long-term debt |  |  | 398,094 |  |  |  |
Long-term operating lease liabilities |  |  | 269,387 |  |  |  |
Deferred income taxes |  |  | 29,426 |  |  |  |
Other liabilities |  |  | 62,819 |  |  |  |
Total noncurrent liabilities |  |  | 759,726 |  |  |  |
Total liabilities |  |  | 1,121,118 |  |  |  |
Redeemable noncontrolling interest |  |  | 9,543 |  |  |  |
Shareholders' equity: |  |  |  |  |  |  |
Common Stock, $0.01 Par Value |  |  | 801 |  |  |  |
Additional paid-in capital |  |  | 486,061 |  |  |  |
Retained earnings |  |  | 2,012,902 |  |  |  |
Accumulated other comprehensive loss |  |  | (137,290) |  |  |  |
Treasury Stock, at cost |  |  | (970,944) |  |  |  |
Total shareholders' equity |  |  | 1,391,530 |  |  |  |
Total liabilities and shareholders' equity |  |  | 2,522,191 |  |  |  |
ASC 842 | June 30, 2019 |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 299,445 |  |  |
Investments in marketable securities |  |  |  | 8,680 |  |  |
Restricted cash |  |  |  | 1,022 |  |  |
Accounts receivable, net |  |  |  | 157,829 |  |  |
Prepaid expenses and other current assets |  |  |  | 37,724 |  |  |
Total current assets |  |  |  | 504,700 |  |  |
Noncurrent assets: |  |  |  |  |  |  |
Property and equipment, net |  |  |  | 364,683 |  |  |
Deferred income taxes |  |  |  | 18,314 |  |  |
Intangible assets, net |  |  |  | 418,097 |  |  |
Goodwill |  |  |  | 874,451 |  |  |
Other assets, net |  |  |  | 62,451 |  |  |
Total noncurrent assets |  |  |  | 1,737,996 |  |  |
Total assets |  |  |  | 2,242,696 |  |  |
Current liabilities: |  |  |  |  |  |  |
Accounts payable |  |  |  | 57,627 |  |  |
Accrued salaries, wages and benefits |  |  |  | 64,492 |  |  |
Accrued liabilities |  |  |  | 86,722 |  |  |
Deferred revenue |  |  |  | 99,790 |  |  |
Current portion of long-term debt |  |  |  | 3,000 |  |  |
Total current liabilities |  |  |  | 311,631 |  |  |
Noncurrent liabilities: |  |  |  |  |  |  |
Long-term debt |  |  |  | 398,094 |  |  |
Deferred income taxes |  |  |  | 29,426 |  |  |
Other liabilities |  |  |  | 102,472 |  |  |
Total noncurrent liabilities |  |  |  | 529,992 |  |  |
Total liabilities |  |  |  | 841,623 |  |  |
Redeemable noncontrolling interest |  |  |  | 9,543 |  |  |
Shareholders' equity: |  |  |  |  |  |  |
Common Stock, $0.01 Par Value |  |  |  | 801 |  |  |
Additional paid-in capital |  |  |  | 486,061 |  |  |
Retained earnings |  |  |  | 2,012,902 |  |  |
Accumulated other comprehensive loss |  |  |  | (137,290) |  |  |
Treasury Stock, at cost |  |  |  | (970,944) |  |  |
Total shareholders' equity |  |  |  | 1,391,530 |  |  |
Total liabilities and shareholders' equity |  |  |  | $ 2,242,696 |  |  |
ASC 842 | Adjustments due to adoption of ASC 842 |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  | (3,483) |  |  |  |
Total current assets |  |  | (3,483) |  |  |  |
Noncurrent assets: |  |  |  |  |  |  |
Operating lease assets |  |  | 282,978 |  |  |  |
Total noncurrent assets |  |  | 282,978 |  |  |  |
Total assets |  |  | 279,495 |  |  |  |
Current liabilities: |  |  |  |  |  |  |
Accrued liabilities |  |  | (16,946) |  |  |  |
Current operating lease liabilities |  |  | 66,707 |  |  |  |
Total current liabilities |  |  | 49,761 |  |  |  |
Noncurrent liabilities: |  |  |  |  |  |  |
Long-term operating lease liabilities |  |  | 269,387 |  |  |  |
Other liabilities |  |  | (39,653) |  |  |  |
Total noncurrent liabilities |  |  | 229,734 |  |  |  |
Total liabilities |  |  | 279,495 |  |  |  |
Shareholders' equity: |  |  |  |  |  |  |
Total liabilities and shareholders' equity |  |  | 279,495 |  |  |  |
ASC 842 | Adjustments due to adoption of ASC 842 | Accrued Liabilities [Member] |  |  |  |  |  |  |
Shareholders' equity: |  |  |  |  |  |  |
Deferred rent liability, current |  |  | 6,800 |  |  |  |
Restructuring liability, current |  |  | 10,100 |  |  |  |
ASC 842 | Adjustments due to adoption of ASC 842 | Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |
Shareholders' equity: |  |  |  |  |  |  |
Prepaid Rent |  |  | 3,500 |  |  |  |
ASC 842 | Adjustments due to adoption of ASC 842 | Other Noncurrent Liabilities [Member] |  |  |  |  |  |  |
Shareholders' equity: |  |  |  |  |  |  |
Deferred rent liability, Noncurrent |  |  | 24,800 |  |  |  |
Restructuring liability, Noncurrent |  |  | $ 14,900 |  |  |  |

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