Organization and Summary of Significant Accounting Policies - (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Additions to property and equipment and capitalized labor, net		$ (19,251)	$ (8,020)
Reclassification of stranded tax effects resulting from the Tax Cuts and Jobs Act		$ 0
Federal statutory income tax rate		24.50%
Tax provision recognized for the Act		$ 2,800
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax rate used to remeasure deferred tax assets and liabilities		24.50%
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax rate used to remeasure deferred tax assets and liabilities		21.00%
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded tax effects resulting from the Tax Cuts and Jobs Act		$ 1,455
Retained Earnings | Subsidiary | Cash Converters International Limited | Early adoption effect | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded tax effects resulting from the Tax Cuts and Jobs Act	$ 1,500
Reclassification to conform to current period
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Additions to property and equipment and capitalized labor, net		$ (4,100)	$ (2,700)