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Stockholders’ Equity - Narrative (Details) - USD ($) |  |  | 3 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 07, 2019 | Sep. 30, 2019 | Jun. 30, 2019
Employee Stock Purchase Plan | Employee Stock Option |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of exercisable options |  |  |  | 1,300,000
Minimum annual contributions per employee, percent |  |  |  | 1.00%
Maximum annual contributions per employee, percent |  |  |  | 10.00%
Maximum annual contributions per employee, amount |  |  |  | $ 25,000
Discount from market price |  |  |  | 15.00%
Shares issued under employee stock purchase plan (in shares) | 12,638 |  |  |
Price per share (in dollars per share) | $ 66.26 |  | $ 66.26 |
Compensation costs |  |  | $ 100,000 |
Tax benefit recognized on compensation costs |  |  | $ 0 |
Subordinated Debt | 7.375% Subordinated Debentures due February 27, 2054 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Long-term debt, gross |  | $ 150,000,000.0 |  |
Stated interest rate |  | 7.375% |  |
Private Placement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares issued in transaction (in shares) |  | 1,552,500 |  |
Sale of stock, price per share (in dollars per share) |  | $ 83.00 |  |
Gross proceeds from issuance of common stock |  | $ 128,900,000 |  |
Transaction costs |  | 1,700,000 |  |
Net proceeds from issuance of common stock |  | 127,200,000 |  |
Accrued Liabilities and Other Liabilities | Private Placement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Transaction costs |  | $ 200,000 |  |

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