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Stockholders' Equity (Details) - USD ($)			1 Months Ended	3 Months Ended		121 Months Ended	164 Months Ended	180 Months Ended
	Nov. 10, 2020	May 15, 2020	May 03, 2021	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2020	Mar. 13, 2020	Mar. 05, 2019	May 16, 2018	May 19, 2015
Schedule of Shareholders' Equity [Line Items]
Stock repurchase program, authorized amount									$ 20,000,000	$ 20,000,000	$ 15,000,000
Stock repurchased during period (in shares)				87,322	246,460			14,204,438
Aggregate price of shares repurchased since inception				$ 6,402,000	$ 12,518,000
Average price of shares repurchased since inception (per share)				$ 73.31	$ 50.79			$ 17.39
Dividend Declared
Schedule of Shareholders' Equity [Line Items]
Cash dividends declared per common share (in dollars per share)	$ 0.19	$ 0.19
Open market
Schedule of Shareholders' Equity [Line Items]
Stock repurchase program amount authorized (in shares)												5,700,000
Stock repurchased during period (in shares)				0	103,689	4,205,255
Aggregate price of shares repurchased since inception				$ 0	$ 4,987,000	$ 74,793,000
Average price of shares repurchased since inception (per share)				$ 0	$ 48.10	$ 17.79
401(k)
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)				70,350	123,672			7,977,010
Aggregate price of shares repurchased since inception				$ 5,185,000	$ 6,578,000			$ 150,185,000
Average price of shares repurchased since inception (per share)				$ 73.70	$ 53.19			$ 18.83
401(k) | Subsequent Event
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)			13,337
Aggregate price of shares repurchased since inception			$ 900,000
Directors and employees
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)				16,972	19,099		2,022,173
Aggregate price of shares repurchased since inception				$ 1,217,000	$ 953,000		$ 21,968,000
Average price of shares repurchased since inception (per share)				$ 71.71	$ 49.90		$ 10.86

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