Share-Based Compensation - Narrative (Details)	9 Months Ended
Jun. 30, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance measurement period	3 years
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, weighted-average exercise price (in dollars per share)	$ 31.94
Stock option granted, weighted-average grant date fair value (in dollars per share)	6.63
Time-based stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, grant date fair value (in dollars per share)	31.31
Performance-based stock awards (maximum that can be earned)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, grant date fair value (in dollars per share)	$ 32.73
Performance-based stock awards granted, number of units (in shares) \| shares	252,406

Represents performance measurement period used to determined shares granted included in performance-based stock awards.

No definition available.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans included in performance-based stock awards whose payout level is based upon the Company's total shareholder return.

+ References

No definition available.

+ Details

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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=116856206&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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