Commitments and Contingencies Commitments and Contingencies (Details 1) $ in Thousands	May 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase obligation	$ 49,762
Purchase obligation, 2018	8,443
Purchase obligation, 2019	8,726
Purchase obligation, 2020	9,162
Purchase obligation, 2021	8,709
Purchase obligation, 2022 and thereafter	14,722
Royalties	44,000
Royalties, 2018	2,500
Royalties, 2019	3,000
Royalties, 2020	3,500
Royalties, 2021	3,500
Royalties, 2022 and thereafter	31,500
Other	834
Other, 2018	167
Other, 2019	167
Other, 2020	167
Other, 2021	167
Other, 2022 and thereafter	166
Total	94,596
Total, 2018	11,110
Total, 2019	11,893
Total, 2020	12,829
Total, 2021	12,376
Total, 2022 and thereafter	$ 46,388