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Stock-based Compensation (Tables) | 6 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of stock-based compensation expense | Following is a summary of stock-based compensation expense related to stock options and restricted stock awards for the three and six months ended March 31, 2021 and 2020, respectively.
| Three Months Ended |  | Six Months Ended
| March 31, |  | March 31,
in thousands | 2021 |  | 2020 |  | 2021 |  | 2020
Stock-based compensation expense | $ | 2,549 |  |  | $ | 899 |  |  | $ | 6,060 |  |  | $ | 3,210 |
Schedule of stock options outstanding | Following is a summary of stock option activity for the six months ended March 31, 2021:
| Six Months Ended
| March 31, 2021
| Shares |  | Weighted Average Exercise Price
Outstanding at beginning of period | 392,465 |  |  | $ | 15.47 |
Exercised | (167,435) |  |  | 13.03 |
Outstanding at end of period | 225,030 |  |  | $ | 17.81 |
Exercisable at end of period | 218,528 |  |  | $ | 18.05 |
Schedule of nonvested stock awards activity | Following is a summary of restricted stock activity for the six months ended March 31, 2021:
| Six Months Ended March 31, 2021
| Performance-Based Restricted Shares |  | Time-Based Restricted Shares |  | Total Restricted Shares
Beginning of period | 796,024 |  |  | 610,130 |  |  | 1,406,154 |
Granted (a) | 164,296 |  |  | 246,550 |  |  | 410,846 |
Vested | (222,165) |  |  | (278,411) |  |  | (500,576) |
Forfeited | — |  |  | (15,490) |  |  | (15,490) |
End of period | 738,155 |  |  | 562,779 |  |  | 1,300,934 |
(a) Each of our performance-based restricted share represents a contingent right to receive one share of the Company's common stock if vesting is satisfied at the end of the three-year performance period. Our performance stock award plans provide that any performance shares earned in excess of the target number of performance shares issued may be settled in cash or additional shares at the discretion of the Compensation Committee. In November 2020, we issued 60,930 shares earned above target level based on the performance level achieved under the fiscal 2018 performance-based award plan.

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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