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Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 | May 07, 2018 | May 31, 2014 | Jun. 30, 2014 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |
Maximum number of shares per participant, 12 month period (in shares) |  |  | 1,000,000.0 | 2,500,000.0 |  |  |  |
Extension of plan term |  |  |  | 10 years |  |  |  |
Share-based compensation costs charged against income |  |  |  |  | $ 2,700 | $ 3,000 | $ 4,300 | $ 4,700
Tax benefit recognized from share-based compensation expense |  |  |  |  | 500 | $ 1,000 | 800 | 1,500
Unrecognized compensation costs related to nonvested awards |  |  |  |  | $ 9,400 |  | $ 9,400 |
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition |  |  |  |  |  |  | 1 year |
Total fair value of vested shares |  |  |  |  |  |  | $ 11,900 | 6,700
Proceeds from exercise of stock options |  |  |  |  |  |  | 1,028 | 1,466
Tax benefit realized from exercise of stock options |  |  |  |  |  |  | $ 1,200 | $ 1,200
Shares available for issuance under the Plan (in shares) |  |  |  |  | 1,800,000 |  | 1,800,000 |
Stock options granted (in shares) |  |  |  |  |  |  | 294,500 | 182,800
Options, Additional Disclosures: |  |  |  |  |  |  |  |
Options granted, weighted-average grant-date fair value (in USD per share) |  |  |  |  |  |  | $ 10.22 | $ 21.20
Options exercised, aggregate intrinsic value |  |  |  |  |  |  | $ 300 |
Performance Shares |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |
Share grants in period (in shares) |  | 103,406 |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |
Share grants in period (in shares) |  | 100,399 |  |  |  |  | 226,400 | 105,800
Restricted Stock Units (RSUs) | Employee |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  | 3 years |
Restricted Stock Units (RSUs) | Employee | Maximum |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  | 3 years |
Restricted Stock Units (RSUs) | Director |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |
Share grants in period (in shares) | 3,779 |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |
Number of common shares into which each RSU may be converted (in shares) |  |  |  |  |  |  | 1 |
Period following director's term in which RSUs may be settled |  |  |  |  |  |  | 6 months |
Stock Options |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |
Stock options granted (in shares) |  | 294,484 |  |  |  |  |  |
Stock options granted, exercise price (in USD per share) |  | $ 29.46 |  |  |  |  |  |
Stock Options | Minimum |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  | 3 years |
Stock Options | Maximum |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  | 5 years |
Options, Additional Disclosures: |  |  |  |  |  |  |  |
Award exercisability period, from date of grant |  |  |  |  |  |  | 10 years |
Long-term Equity Incentive Plan, 2005 |  |  |  |  |  |  |  |
Share-based Compensation, Aggregate Disclosures: |  |  |  |  |  |  |  |
Number of shares authorized for grant under 2005 Long-Term Equity Incentive Plan (in shares) |  |  | 5,000,000.0 |  |  |  |  |
Number of additional shares authorized (in shares) |  |  |  | 1,800,000.0 |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: 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=109197908&loc=d3e5047-113901 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 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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