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Commitments and Contingencies (Details Textual) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 14, 2014 | Nov. 08, 2012 | May 31, 2014 Petition Lawsuit | May 31, 2013 | May 31, 2012
Commitments and Contingencies (Textual) [Abstract] |  |  |  |  |
Aggregate rental costs under operating leases |  |  | $ 2,000,000 | $ 2,500,000 | $ 3,100,000
Number of lawsuits against biolitec previously settled for which seeking defense and indemnification |  |  | 2 |  |
Partial judgment granted |  | 23,200,000 |  |  |
Judgment entered in favor | 74,900,000 |  |  |  |
Number of petitions filed for reexamination of patents |  |  | 3 |  |
Number of rejected patent claims |  |  | 40 of 41 patent |  |
Total future purchase obligations due through 2018 |  |  | 12,500,000 |  |
Purchase obligations after 2018 |  |  | $ 0 |  |

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- Definition Number of lawsuits. + References No definition available. + Details
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- Definition Number of patent claims rejected. + References No definition available. + Details
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- Definition Number of patents asserted for reexamination. + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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