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Fair Value Measurements (Financial Instruments on a Recurring Basis) (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified | Feb. 28, 2014 | May 31, 2013
--- | --- | ---
Level 1 |  |
Fair value on a recurring basis |  |
Cash and cash equivalents | $ 348,859 | $ 352,273
Accounts receivable, net |  | 0
Total assets at fair value | 348,859 | 352,273
Current accrued liabilities | 0 |
Total liabilities at fair value | 0 |
Level 1 | Canadian treasury securities |  |
Fair value on a recurring basis |  |
Marketable securities | 0 |
Level 1 | U.S. municipal bonds |  |
Fair value on a recurring basis |  |
Marketable securities |  | 0
Level 2 |  |
Fair value on a recurring basis |  |
Cash and cash equivalents | 0 | 0
Accounts receivable, net |  | 39
Total assets at fair value | 4,840 | 5,719
Current accrued liabilities | 365 |
Total liabilities at fair value | 365 |
Level 2 | Canadian treasury securities |  |
Fair value on a recurring basis |  |
Marketable securities | 4,840 |
Level 2 | U.S. municipal bonds |  |
Fair value on a recurring basis |  |
Marketable securities |  | 5,680
Level 3 |  |
Fair value on a recurring basis |  |
Cash and cash equivalents | 0 | 0
Accounts receivable, net |  | 0
Total assets at fair value | 0 | 0
Current accrued liabilities | 0 |
Total liabilities at fair value | 0 |
Level 3 | Canadian treasury securities |  |
Fair value on a recurring basis |  |
Marketable securities | 0 |
Level 3 | U.S. municipal bonds |  |
Fair value on a recurring basis |  |
Marketable securities |  | 0
Fair Value |  |
Fair value on a recurring basis |  |
Cash and cash equivalents | 348,859 | 352,273
Accounts receivable, net |  | 39
Total assets at fair value | 353,699 | 357,992
Current accrued liabilities | 365 |
Total liabilities at fair value | 365 |
Fair Value | Canadian treasury securities |  |
Fair value on a recurring basis |  |
Marketable securities | 4,840 |
Fair Value | U.S. municipal bonds |  |
Fair value on a recurring basis |  |
Marketable securities |  | $ 5,680

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- Definition Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13487-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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