Commitments and Contingencies (Details) $ in Thousands					28 Months Ended
	May 31, 2018 USD ($) ft²	Jan. 11, 2018 USD ($) a ft²	Oct. 04, 2017 USD ($) a ft² building	Jan. 25, 2016 USD ($) a	May 31, 2018 USD ($)	Jun. 01, 2018 USD ($) a	Mar. 29, 2018 ft²
Purchase and sale obligations
Number of acres | ft²							234,000
Number of Buildings | building			2
Agreement to sell
Purchase and sale obligations
Purchase obligations				$ 7,700
Number of acres | a				280
Agreement Term of Extension				3 years
Agreement Extension Fee					$ 260
Purchase agreement
Purchase and sale obligations
Purchase obligations		$ 3,600	$ 2,600
Area Of Building | ft²		156,000	283,000
Number of acres | a		14	22
Purchase agreement | Subsequent events
Purchase and sale obligations
Purchase obligations						$ 4,700
Number of acres | a						36
Amended purchase agreement
Purchase and sale obligations
Purchase obligations		$ 3,100
Obligations For Investments In Real Estate Assets
Purchase and sale obligations
Purchase obligations	$ 10,397				$ 10,397
Area Of Building | ft²	134,000