Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements Fair Value Measurements (Details Textual)

v2.4.0.8
Fair Value Measurements Fair Value Measurements (Details Textual)
3 Months Ended
Aug. 31, 2013
Fair Value Disclosures (Textuals) [Abstract]  
Maximum maturity on short-term investments classified as cash equivalents 90 days