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Fair Value Measurements (Tables) | 9 Months Ended
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Feb. 28, 2018
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Financial Instruments Measured on a Recurring Basis | These financial instruments measured at fair value on a recurring basis are summarized below:
| As of February 28, 2018
(In thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Fair Value
Cash and cash equivalents | $ | 152,563 |  |  | $ | — |  |  | $ | — |  |  | $ | 152,563 |
Marketable securities: |  |  |  |  |  |  |
Canadian treasury securities | — |  |  | 33,693 |  |  | — |  |  | 33,693 |
Total assets at fair value | $ | 152,563 |  |  | $ | 33,693 |  |  | $ | — |  |  | $ | 186,256 |
| As of May 31, 2017
(In thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Fair Value
Cash and cash equivalents | $ | 169,266 |  |  | $ | — |  |  | $ | — |  |  | $ | 169,266 |
Marketable securities: |  |  |  |  |  |  |
Canadian treasury securities | — |  |  | 22,219 |  |  | — |  |  | 22,219 |
Total assets at fair value | $ | 169,266 |  |  | $ | 22,219 |  |  | $ | — |  |  | $ | 191,485 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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