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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Compensation Cost for Stock-based Payment Arrangements Recognized in Selling, General and Administrative Expense | A summary of compensation cost for stock-based payment arrangements recognized in selling, general and administrative expense is as follows:
| Three Months Ended June 30, |  | Nine Months Ended June 30,
(in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Compensation expense |  |  |  |  |  |  |
Stock options | $ | 719 |  |  | $ | 1,815 |  |  | $ | 3,073 |  |  | $ | 5,887 |
Restricted stock | 6,771 |  |  | 6,111 |  |  | 19,374 |  |  | 17,585 |
Performance share units | 1,388 |  |  | — |  |  | 3,020 |  |  | — |
| $ | 8,878 |  |  | $ | 7,926 |  |  | $ | 25,467 |  |  | $ | 23,472 |
Summary of Stock Option Activity | A summary of stock option activity under all existing long-term incentive plans for the three and nine months ended June 30, 2019 is presented in the following tables:
| Three Months Ended June 30, 2019
(in thousands, except per share amounts and years) | Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term in Years |  | Aggregate Intrinsic Value
Outstanding at April 1, 2019 | 3,292 |  |  | $ | 60.77 |  |  |  |  |
Exercised | (15 | ) |  | 42.67 |  |  |  |  |
Forfeited/Expired | (14 | ) |  | 62.24 |  |  |  |  |
Outstanding at June 30, 2019 | 3,263 |  |  | $ | 60.85 |  |  | 5.42 |  | $ | 3,158 |
Vested and expected to vest at June 30, 2019 | 3,263 |  |  | $ | 60.85 |  |  | 5.42 |  | $ | 3,158 |
Exercisable at June 30, 2019 | 2,505 |  |  | $ | 60.37 |  |  | 4.69 |  | $ | 3,158 |
| Nine Months Ended June 30, 2019
(in thousands, except per share amounts) | Shares |  | Weighted Average Exercise Price
Outstanding at October 1, 2018 | 3,499 |  |  | $ | 58.62 |
Exercised | (213 | ) |  | 24.21 |
Forfeited | (23 | ) |  | 60.77 |
Outstanding at June 30, 2019 | 3,263 |  |  | $ | 60.85 |
Summary of Restricted Stock Awards and Changes in Restricted Stock Outstanding | A summary of the status of our performance share units as of June 30, 2019 and changes in performance share units outstanding during the nine months then ended is presented below:
| Nine Months Ended June 30, 2019
(in thousands, except per share amounts) | Shares |  | Weighted Average Grant Date Fair Value per Share
Outstanding at October 1, 2018 | — |  |  | $ | — |
Granted | 145 |  |  | 62.66 |
Outstanding at June 30, 2019 | 145 |  |  | $ | 62.66 |
A summary of the status of our restricted stock awards as of June 30, 2019 and changes in restricted stock outstanding during the nine months then ended is presented below:
| Nine Months Ended June 30, 2019
(in thousands, except per share amounts) | Shares |  | Weighted Average Grant Date Fair Value per Share
Outstanding at October 1, 2018 | 1,001 |  |  | $ | 63.74 |
Granted | 475 |  |  | 58.45 |
Vested (1) | (369 | ) |  | 64.32 |
Forfeited | (17 | ) |  | 61.01 |
Outstanding at June 30, 2019 | 1,090 |  |  | $ | 61.28 |
(1) The number of restricted stock awards vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements.

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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