Commitments and Contingent Liabilities (Details 2)	6 Months Ended
	Aug. 31, 2019 USD ($)
Income Tax Contingency [Line Items]
Proceeds received	$ 26,500
Deferred costs	5,600
Net benefit	20,900
October 2020
Income Tax Contingency [Line Items]
Proceeds received	10,700
Deferred costs	3,000.0
Net benefit	7,700
May 2023
Income Tax Contingency [Line Items]
Proceeds received	6,000.0
Deferred costs	900
Net benefit	5,100
July 2025
Income Tax Contingency [Line Items]
Proceeds received	6,600
Deferred costs	900
Net benefit	5,700
August 2025
Income Tax Contingency [Line Items]
Proceeds received	3,200
Deferred costs	800
Net benefit	$ 2,400