Dividends and Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended							2 Months Ended							3 Months Ended			5 Months Ended	11 Months Ended
	May 31, 2021	Mar. 31, 2021	Dec. 31, 2020	May 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Oct. 31, 2021	Apr. 30, 2021	Jan. 31, 2021	Oct. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Apr. 30, 2019	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019	Apr. 30, 2020	Oct. 31, 2021
Dividends Payable [Line Items]
Dividend Per Share (in USD per share)									$ 0.22	$ 0.21	$ 0.21	$ 0.21	$ 0.20		$ 0.22		$ 0.21
Common Shares
Distributions Declared									$ 56,029	$ 0	$ 43,282	$ 42,568	$ 0		$ 57,897		$ 43,271	$ 129,121
Distributions Paid	$ 57,900			$ 43,300	$ 56,000		$ 42,600		56,029	53,820	$ 0	$ 42,568	38,796		57,897		$ 43,271	$ 124,025
Subsequent Event
Dividends Payable [Line Items]
Dividend Per Share (in USD per share)								$ 0.22
Common Shares
Distributions Declared								$ 59,026											$ 172,952
Distributions Paid								$ 0											$ 168,538
Dividend equivalents accrued on unvested restricted stock units to be paid when the awards vest.
Common Shares
Distributions Paid	$ (178)	$ (179)	$ (693)	$ (232)		$ (169)	$ (233)
Dividend equivalents paid on unvested restricted stock units that are not expected to vest (recognized as additional compensation).
Common Shares
Distributions Paid									$ 7	6			$ 4	$ 10	$ 6	$ 10
Dividend equivalents paid on vested restricted stock units related to the market performance-based awards granted in 2018.
Common Shares
Distributions Paid										$ 1,823