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Share-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended	6 Months Ended
	Aug. 03, 2021	May 03, 2021	May 31, 2014	Jun. 30, 2014	Sep. 30, 2021	Sep. 30, 2020	Jun. 23, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares per participant, 12 month period			1,000,000	2,500,000
Extension of plan term				10 years
Unrecognized compensation costs related to nonvested awards					$ 4.0
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition					2 years 2 months 12 days
Shares available for issuance under the Plan (in shares)					2,500,000
Stock options granted (in shares)					234,200	249,900
Options exercised, aggregate intrinsic value					$ 1.8
Restricted Stock Units (RSUs) & Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs related to nonvested awards					$ 11.2
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition					2 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share grants in period		77,345
Restricted Stock Units (RSUs) & Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share grants in period		73,108
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)		222,660
Stock options granted, exercise price (in USD per share)		$ 44.33
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share grants in period		1,636			170,800	179,700
Restricted Stock Units (RSUs) | Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share grants in period	2,808
Long-term Equity Incentive Plan, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant			5,000,000
Number of additional shares authorized				1,800,000
Long-term Incentive Plan, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)							2,827,210
Number of new shares for future issuance under 2020 long-term incentive plans							2,000,000
Number of unissued shares reserved for 2020 long-term incentive plans							827,210

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The highest quantity of shares an employee can purchase under the plan per period.

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