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Fair Value Measurements - Schedule of Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Feb. 29, 2016 | May. 31, 2015
--- | --- | ---
Fair value on a recurring basis |  |
Marketable securities | $ 71,703 | $ 16,081
Fair Value, Measurements, Recurring |  |
Fair value on a recurring basis |  |
Cash and cash equivalents | 315,116 | 417,073
Total assets at fair value | 386,819 | 433,154
Total liabilities at fair value | 22,438 |
Fair Value, Measurements, Recurring | Interest rate lock agreement |  |
Fair value on a recurring basis |  |
Long term accrued liabilities | 22,438 |
Fair Value, Measurements, Recurring | Canadian treasury securities |  |
Fair value on a recurring basis |  |
Marketable securities | 71,703 | 16,081
Fair Value, Measurements, Recurring | Level 1 |  |
Fair value on a recurring basis |  |
Cash and cash equivalents | 265,149 | 417,073
Total assets at fair value | 265,149 | 417,073
Total liabilities at fair value | 0 |
Fair Value, Measurements, Recurring | Level 1 | Interest rate lock agreement |  |
Fair value on a recurring basis |  |
Long term accrued liabilities | 0 |
Fair Value, Measurements, Recurring | Level 1 | Canadian treasury securities |  |
Fair value on a recurring basis |  |
Marketable securities | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |
Fair value on a recurring basis |  |
Cash and cash equivalents | 49,967 | 0
Total assets at fair value | 121,670 | 16,081
Total liabilities at fair value | 22,438 |
Fair Value, Measurements, Recurring | Level 2 | Interest rate lock agreement |  |
Fair value on a recurring basis |  |
Long term accrued liabilities | 22,438 |
Fair Value, Measurements, Recurring | Level 2 | Canadian treasury securities |  |
Fair value on a recurring basis |  |
Marketable securities | 71,703 | 16,081
Fair Value, Measurements, Recurring | Level 3 |  |
Fair value on a recurring basis |  |
Cash and cash equivalents | 0 | 0
Total assets at fair value | 0 | 0
Total liabilities at fair value | 0 |
Fair Value, Measurements, Recurring | Level 3 | Interest rate lock agreement |  |
Fair value on a recurring basis |  |
Long term accrued liabilities | 0 |
Fair Value, Measurements, Recurring | Level 3 | Canadian treasury securities |  |
Fair value on a recurring basis |  |
Marketable securities | $ 0 | $ 0

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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=36462937&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=51813488&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=49167202&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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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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