Summary of Significant Accounting Policies - Accounting Standards Recently Adopted (Details) - USD ($) $ in Thousands	Feb. 28, 2019	Mar. 01, 2018	Feb. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	$ 45,870		$ 0
Operating lease, liability	$ 46,847
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset		$ 42,100
Operating lease, liability		$ 42,800