Leases - Supplemental Balance Sheet Information (Details) $ in Thousands	May 31, 2020 USD ($)
Leases [Abstract]
Operating lease ROU asset	$ 10,146
Less: Current portion of lease obligations	2,077
Long-term lease obligations	8,345
Total lease obligations	$ 10,422
Weighted average remaining term (in years)	5 years
Weighted average discount rate (percent)	4.20%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent