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Stockholders' Equity Stockholders' Equity (Stock-Based Compensation Plans) (Details) - USD ($) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 15, 2021 | Aug. 12, 2021 | Jun. 01, 2021 | Apr. 16, 2021 | Feb. 19, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  |  |  | 32,665 | 17,913 |  | 314,294 | 17,913
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price |  |  |  |  |  |  | $ 5.70 |  | $ 21.78 | $ 5.70
Payment, Tax Withholding, Share-based Payment Arrangement |  |  |  |  |  |  |  |  | $ 1,433,000 | $ 281,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares |  |  |  |  |  |  |  |  | 12,980 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period, Description |  |  |  |  |  | 17,790 | 4,426 |  | 166,359 | 4,426
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  | $ 21.81 |  |  |  |
Additional authorized amount |  |  |  |  |  | $ 50,000,000 |  |  | $ 50,000,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Returned for Payroll Taxes |  |  |  |  |  | 2,192 | 1,333 |  | 20,163 | 1,333
Advsior |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  | 112 | 224 |  | 389 | 808
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value |  |  |  |  |  | $ 5,000 | $ 6,000 |  | $ 15,000 | $ 15,000
Stock options |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  | 600,000 | 300,000 |  | 5,000,000 | 300,000
Proceeds from Stock Options Exercised |  |  |  |  |  | 0 | 0 |  | 880,000 | 0
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  | $ 82,000 | $ 31,000 |  | $ 1,058,000 | $ 31,000
Stock options | Black-Scholes |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  | 0 | 0 |  | 701,400 | 20,000
Share price at grant date |  |  |  |  |  |  |  |  |  | $ 18.02
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value |  |  |  |  |  | $ 0 | $ 0 |  |  | $ 92,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period |  |  |  |  |  | 6,000 | 8,800 |  | 19,684 | 146,034
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value |  |  |  |  |  |  |  |  | $ 7,115,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures Fair Valueriod |  |  |  |  |  | $ 61,000 | $ 52,000 |  | $ 181,000 | $ 846,000
Stock options | Monte-Carlo Pricing Model |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  | 150,000 |
Share price at grant date |  |  |  |  |  |  |  |  | $ 34.79 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value |  |  |  |  |  |  |  |  | $ 1,700,000 |
Stock options | Monte-Carlo Pricing Model | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  | 50,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  |  |  |  |  |  | 53.39 |
Stock options | Monte-Carlo Pricing Model | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  | 100,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  |  |  |  |  |  | 77.34 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  | 0 | 0 |  | 9,300 | 10,200
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period, Fair Value |  |  |  |  |  | $ 0 | $ 0 |  | $ 27,000 | $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Aggregate Grant Date Market Value |  |  |  |  |  | $ 0 | $ 0 |  | $ 324,000 | $ 255,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  |  |  |  | 711 | 714 |  | 10,399 | 10,588
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  | $ 28,000 | $ 16,000 |  | $ 375,000 | $ 250,000
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited |  |  |  |  |  | 0 | 0 |  | 966 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  | $ 34.79 | $ 25.00
Performance awards |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share price at grant date | $ 45.27 | $ 39.48 | $ 38.78 | $ 35.83 |  |  |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost |  |  | $ 2,600,000 |  |  |  |  | $ 1,700,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  | 237,500 | 29,548 | 9,782 | 368,921 | 39,802 | 23,756
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value |  |  |  |  | $ 2,800,000 | $ 1,062,000 | $ 244,000 |  | $ 1,464,000 | $ 469,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  |  |  |  |  | 6,987 | 0 |  | 41,922 | 33,538
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period, Fair Value |  |  |  |  |  | $ 101,000 | $ 0 |  | $ 598,000 | $ 631,000

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