Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Adjustment	Total Meta Stockholders’ Equity	Total Meta Stockholders’ Equity Adjustment	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Adjustment	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling interest	Noncontrolling interest Adjustment
Beginning Balance at Sep. 30, 2020	$ 847,308	$ (10,803)	$ 843,705	$ (8,351)	$ 344	$ 594,569	$ 234,927	$ (8,351)	$ 17,542	$ (3,677)	$ 3,603	$ (2,452)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared on common stock	(3,209)		(3,209)				(3,209)
Issuance of common stock due to ESOP	3,036		3,036		2	3,034
Repurchases of common stock	(86,977)		(86,977)		(27)	27	(84,999)			(1,978)
Stock compensation	3,592		3,592			3,592
Total other comprehensive (loss)	(4,733)		(4,733)						(4,733)
Net income	89,167		87,103				87,103				2,064
Net investment by (distribution to) noncontrolling interests	(2,123)										(2,123)
Ending Balance at Mar. 31, 2021	835,258		834,166		319	601,222	225,471		12,809	(5,655)	1,092
Beginning Balance at Dec. 31, 2020	813,210		811,674		326	598,669	198,000		20,119	(5,440)	1,536
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared on common stock	(1,595)		(1,595)				(1,595)
Repurchases of common stock	(30,215)		(30,215)		(7)	7	(30,000)			(215)
Stock compensation	2,546		2,546			2,546
Total other comprehensive (loss)	(7,310)		(7,310)						(7,310)
Net income	59,909		59,066				59,066				843
Net investment by (distribution to) noncontrolling interests	(1,287)										(1,287)
Ending Balance at Mar. 31, 2021	835,258		834,166		319	601,222	225,471		12,809	(5,655)	1,092
Beginning Balance at Sep. 30, 2021	871,884		870,729		317	604,484	259,189		7,599	(860)	1,155
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared on common stock	(3,004)		(3,004)				(3,004)
Issuance of common stock due to ESOP	2,886		2,886		1	2,885
Repurchases of common stock	(146,653)		(146,653)		(24)	24	(143,000)			(3,653)
Stock compensation	5,524		5,524			5,524
Total other comprehensive (loss)	(76,973)		(76,973)						(76,973)
Net income	111,408		110,575				110,575				833
Net investment by (distribution to) noncontrolling interests	(1,666)										(1,666)
Ending Balance at Mar. 31, 2022	763,406		763,084		294	612,917	223,760		(69,374)	(4,513)	322
Beginning Balance at Dec. 31, 2021	826,156		825,514		301	610,816	217,991		724	(4,318)	642
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared on common stock	(1,482)		(1,482)				(1,482)
Repurchases of common stock	(42,195)		(42,195)		(7)	7	(42,000)			(195)
Stock compensation	2,094		2,094			2,094
Total other comprehensive (loss)	(70,098)		(70,098)						(70,098)
Net income	50,102		49,251				49,251				851
Net investment by (distribution to) noncontrolling interests	(1,171)										(1,171)
Ending Balance at Mar. 31, 2022	$ 763,406		$ 763,084		$ 294	$ 612,917	$ 223,760		$ (69,374)	$ (4,513)	$ 322