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Stock-Based Compensation Information related to stock options outstanding (Details) (USD $) | May 31, 2012 | May 31, 2011 | May 31, 2010 | May 31, 2009
--- | --- | --- | --- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of exercisable options (in shares) | 2,105,702 | 1,945,207 | 1,838,530 | 1,914,710
$20.29 - 31.00 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number Outstanding (in shares) | 1,725,722 |  |  |
Average Remaining Option Life (In years) | 7.50 |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 26.22 |  |  |
Number Exercisable (in shares) | 176,768 |  |  |
Weighted Average Exercise Price, Exercisable Options (in dollars per share) | 26.97 |  |  |
$31.01 - 34.27 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number Outstanding (in shares) | 1,279,826 |  |  |
Average Remaining Option Life (In years) | 8.61 |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 33.99 |  |  |
Number Exercisable (in shares) | 60,390 |  |  |
Weighted Average Exercise Price, Exercisable Options (in dollars per share) | 33.50 |  |  |
$34.28 - 39.36 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number Outstanding (in shares) | 2,410,094 |  |  |
Average Remaining Option Life (In years) | 6.77 |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 37.49 |  |  |
Number Exercisable (in shares) | 622,774 |  |  |
Weighted Average Exercise Price, Exercisable Options (in dollars per share) | 38.69 |  |  |
$39.37 - 50.47 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number Outstanding (in shares) | 2,193,475 |  |  |
Average Remaining Option Life (In years) | 2.48 |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 42.51 |  |  |
Number Exercisable (in shares) | 1,245,770 |  |  |
Weighted Average Exercise Price, Exercisable Options (in dollars per share) | 42.65 |  |  |
$20.29 - 50.47 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number Outstanding (in shares) | 7,609,117 |  |  |
Average Remaining Option Life (In years) | 6.01 |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 36.04 |  |  |
Number Exercisable (in shares) | 2,105,702 |  |  |
Weighted Average Exercise Price, Exercisable Options (in dollars per share) | 39.90 |  |  |
Minimum [Member] | $20.29 - 31.00 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 20.29 |  |  |
Minimum [Member] | $31.01 - 34.27 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 31.01 |  |  |
Minimum [Member] | $34.28 - 39.36 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 34.28 |  |  |
Minimum [Member] | $39.37 - 50.47 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 39.37 |  |  |
Minimum [Member] | $20.29 - 50.47 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 20.29 |  |  |
Maximum [Member] | $20.29 - 31.00 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 31.00 |  |  |
Maximum [Member] | $31.01 - 34.27 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 34.27 |  |  |
Maximum [Member] | $34.28 - 39.36 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 39.36 |  |  |
Maximum [Member] | $39.37 - 50.47 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 50.47 |  |  |
Maximum [Member] | $20.29 - 50.47 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted Average Exercise Price, Outstanding Options (in dollars per share) | 50.47 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c), d(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a, b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average period remaining as of the balance sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months). + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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