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Stock compensation - RSU and PSU award activity (Details) - $ / shares | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018 | Jun. 30, 2018 | Sep. 30, 2020
Shares Subject to Outstanding Options, Shares |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  |  | 2,602,376
Outstanding at the end of the period (in shares) |  |  |  |  | 3,167,196
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  | $ 79.69
Outstanding at the end of the period (in dollars per share) |  |  |  |  | $ 87.45
Restricted Stock Units (RSUs) |  |  |  |  |
Shares Subject to Outstanding Options, Shares |  |  |  |  |
Granted (in shares) |  |  |  | 190,000 | 1,313,820
Released (in shares) |  |  |  |  | (549,051)
Cancelled (in shares) |  |  |  |  | (114,591)
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |  |  |
Granted (in dollars per share) |  |  |  |  | $ 98.44
Released (in dollars per share) |  |  |  |  | 86.14
Cancelled (in dollars per share) |  |  |  |  | $ 84.62
Performance Stock Units (PSUs) |  |  |  |  |
Shares Subject to Outstanding Options, Shares |  |  |  |  |
Granted (in shares) | 92,347 | 86,975 | 77,243 | 446,500 | 92,347
Released (in shares) |  |  |  |  | (35,455)
Cancelled (in shares) |  |  |  |  | (142,250)
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |  |  |
Granted (in dollars per share) |  |  |  |  | $ 106.47
Released (in dollars per share) |  |  |  |  | 78.85
Cancelled (in dollars per share) |  |  |  |  | $ 68.79

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- Definition Represents the number of shares of employee compensation programs, other than options, released during the period. + References No definition available. + Details
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- Definition Per share weighted average intrinsic value of equity-based compensation awards released. Excludes stock and unit options. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average intrinsic value of award forfeited under share-based payment arrangement. Excludes share and unit options. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average intrinsic value of award granted under share-based payment arrangement. Excludes share and unit options. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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)(ii) -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 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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