Dividends and Distributions - Summary of Dividends Declarations and Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands													12 Months Ended
	Sep. 29, 2022	Jun. 29, 2022	Mar. 29, 2022	Dec. 30, 2021	Sep. 29, 2021	Jun. 29, 2021	Mar. 30, 2021	Dec. 30, 2020	Sep. 29, 2020	Jun. 29, 2020	Mar. 27, 2020	Dec. 30, 2019	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Share-Based Payment Arrangement [Abstract]
Distribution to shareholders (in dollars per share)	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.29	$ 0.29	$ 0.29	$ 0.29	$ 0.29	$ 0.29	$ 0.33	$ 0.46
Cash Distribution	$ 40,223	$ 39,336	$ 37,358	$ 38,291	$ 35,852	$ 35,113	$ 34,311	$ 33,846	$ 33,659	$ 31,851	$ 30,123	$ 40,793	$ 204,806	$ 194,852	$ 195,565
DRIP shares issued (in shares)	0	0	29,928	837,158	876,727	920,150	972,196	0	0	0	0	1,149,409
DRIP Shares Value	$ 11,046	$ 11,933		$ 12,717	$ 13,203	$ 13,674	$ 14,194	$ 14,659	$ 14,851	$ 16,653	$ 14,030	$ 20,230	$ 13,174	$ 41,071	$ 20,230
DRIP share issued and purchased then reissued value			$ 13,902
DRIP shares purchase (in shares)	903,318	917,845	882,358					1,034,149	1,099,595	1,399,836	1,125,098
DRIP shares purchase, weighted average exercised price per share (in dollars per share)	$ 12.23	$ 13.00	$ 15.24					$ 14.18	$ 13.50	$ 11.90	$ 12.47
Proceeds from stock issued during period, amount, DRIP			$ 457
Special distribution to shareholders (in dollars per share)												$ 0.13