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Stock-based Compensation (Tables) | 12 Months Ended
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Aug. 31, 2017
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule Of Stock Options Activity |
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﻿ |  |  |  |  | Weighted-Average |  |
﻿ |  |  |  |  | Remaining |  |
﻿ |  |  | Weighted-Average |  | Contractual Term |  |
﻿ | Number of |  | Exercise Price |  | Per Share |  | Aggregate
﻿Stock Options | Shares |  | Per Share |  | (in years) |  | Intrinsic Value
﻿Outstanding at August 31, 2016 |  | 27,820 |  | $ | 35.59 |  |  |  |  |  |
﻿Granted |  | - |  | $ | - |  |  |  |  |  |
﻿Exercised |  | (21,860) |  | $ | 35.47 |  |  |  |  |  |
﻿Forfeited or expired |  | - |  | $ | - |  |  |  |  |  |
﻿Outstanding at August 31, 2017 |  | 5,960 |  | $ | 36.03 |  |  | 0.1 |  | $ | 435
﻿Exercisable at August 31, 2017 |  | 5,960 |  | $ | 36.03 |  |  | 0.1 |  | $ | 435
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﻿
Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule Of Restricted Stock Units Activity |
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﻿ |  |  | Weighted-Average |  |
﻿ |  |  | Grant Date |  |
﻿ | Number of |  | Fair Value |  | Aggregate
﻿Restricted Stock Units | Shares |  | Per Share |  | Intrinsic Value
﻿Outstanding at August 31, 2016 |  | 130,035 |  | $ | 54.80 |  |  |
﻿Granted |  | 21,501 |  | $ | 109.23 |  |  |
﻿Converted to common shares |  | (34,479) |  | $ | 58.71 |  |  |
﻿Forfeited |  | (287) |  | $ | 81.44 |  |  |
﻿Outstanding at August 31, 2017 |  | 116,770 |  | $ | 63.61 |  | $ | 12,722
﻿Vested at August 31, 2017 |  | 87,258 |  | $ | 52.78 |  | $ | 9,507
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﻿
Market Share Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule Of Valuation Assumptions |
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﻿ | Fiscal Year Ended August 31,
﻿ | 2017 |  | 2016 |  | 2015
﻿Expected volatility |  | 21.1% |  |  | 22.2% |  |  | 22.0%
﻿Risk-free interest rate |  | 1.0% |  |  | 0.9% |  |  | 0.8%
﻿Expected dividend yield |  | 0.0% |  |  | 0.0% |  |  | 0.0%
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Schedule Of Market Share Units Activity |
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﻿ |  |  | Weighted-Average |  |
﻿ |  |  | Grant Date |  |
﻿ | Number of |  | Fair Value |  | Aggregate
﻿Market Share Units | Shares |  | Per Share |  | Intrinsic Value
﻿Outstanding at August 31, 2016 |  | 45,700 |  | $ | 87.82 |  |  |
﻿Granted |  | 14,683 |  | $ | 90.91 |  |  |
﻿Performance factor adjustments |  | 10,974 |  | $ | 73.44 |  |  |
﻿Converted to common shares |  | (25,825) |  | $ | 71.20 |  |  |
﻿Forfeited |  | (613) |  | $ | 82.51 |  |  |
﻿Outstanding at August 31, 2017 (1) |  | 44,919 |  | $ | 94.95 |  | $ | 4,894
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| (1) |  | This figure represents the total number of shares underlying MSU grants assuming achievement of the target number of shares at 100%. As the ultimate number of shares that vest could be as high as 200% of the target, the Company may be required to issue additional shares to satisfy outstanding MSU award grants.
Deferred Performance Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule Of Deferred Performance Share Units |
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﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  | Weighted-Average |  |  |
﻿ |  |  | Grant Date |  |
﻿ | Number of |  | Fair Value |  | Aggregate
﻿Deferred Performance Units | Shares |  | Per Share |  | Intrinsic Value
﻿Outstanding at August 31, 2016 |  | 26,323 |  | $ | 94.54 |  |  |
﻿Granted |  | 25,882 |  | $ | 110.19 |  |  |
﻿Performance factor adjustments |  | (21,240) |  | $ | 94.54 |  |  |
﻿Converted to common shares |  | (89) |  | $ | 94.54 |  |  |
﻿Forfeited |  | - |  | $ | - |  |  |
﻿Outstanding at August 31, 2017 |  | 30,876 |  | $ | 107.66 |  | $ | 3,364
﻿Vested at August 31, 2017 |  | 4,994 |  | $ | 94.54 |  | $ | 544
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- Definition Tabular disclosure for share-based compensation 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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. + Details
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