Contractual interest rate for funds borrowed, under the debt agreement.

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Loans Payable, Senior Notes, and Mortgage Company Loan Facility - Senior Notes (Details 3) - USD ($) $ in Thousands	Oct. 31, 2021	Feb. 28, 2021	Oct. 31, 2020
Senior Notes [Abstract]
Senior notes	$ 2,403,989		$ 2,661,718
5.875 % senior notes due 2022 [Member]
Senior Notes [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	5.875%
Senior notes	$ 409,856		419,876
4.375% Senior Notes due 2023 [Member]
Senior Notes [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	4.375%
Senior notes	$ 400,000		400,000
5.625% Senior notes due 2024 [Member]
Senior Notes [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	5.625%	5.625%
Senior notes	$ 0		250,000
4.875% Senior Notes Due 2025 [Member]
Senior Notes [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Senior notes	$ 350,000		350,000
4.875% Senior Notes Due 2027 [Member]
Senior Notes [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Senior notes	$ 450,000		450,000
4.350% Senior Notes Due 2028 [Member]
Senior Notes [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	4.35%
Senior notes	$ 400,000		$ 400,000
3.80% Senior Notes Due 2029 [Member]
Senior Notes [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			3.80%
Senior notes	400,000		$ 400,000
Senior Notes [Member]
Senior Notes [Abstract]
Deferred issuance costs	$ (5,867)		$ (8,158)