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Stockholders' Equity (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 121 Months Ended | 164 Months Ended | 180 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 17, 2021 | Nov. 10, 2020 | May 15, 2020 | Nov. 01, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Mar. 13, 2020 | Mar. 05, 2019 | May 16, 2018 | May 19, 2015
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 | $ 20,000,000 | $ 15,000,000 |
Stock repurchased during period (in shares) |  |  |  |  |  |  | 242,115 | 429,456 |  |  | 14,359,231 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 16,551,000 | $ 22,520,000 |  | $ 257,095,000 |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 68.36 | $ 52.44 |  |  | $ 17.90 |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  |  |  | $ 0 | $ 0 | $ 0.19 | $ 0.19 |  |  |  |  |  |  |
Dividend Declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.19 | $ 0.19 | $ 0.19 |  |  |  |  |  |  |  |  |  |  |  |
Open market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,700,000
Stock repurchased during period (in shares) |  |  |  |  |  |  | 0 | 103,689 | 4,205,255 |  |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 0 | $ 4,987,000 | $ 74,793,000 |  |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 0 | $ 48.10 | $ 17.79 |  |  |  |  |  |
401(k) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  |  | 220,336 | 303,112 |  |  | 8,126,996 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 15,014,000 | $ 16,403,000 |  |  | $ 160,014,000 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 68.14 | $ 54.12 |  |  | $ 19.69 |  |  |  |
401(k) | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  | 19,545 |  |  |  |  |  |  |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |
Directors and employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  |  | 21,779 | 22,655 |  | 2,026,980 |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 1,537,000 | $ 1,130,000 |  | $ 22,288,000 |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 70.57 | $ 49.88 |  | $ 11.00 |  |  |  |  |

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