Fair Value Measurements - Additional Disclosures (Details) $ in Millions	6 Months Ended
	Mar. 31, 2015 USD ($)
Pawn Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value assumptions, period of estimation	2 months
U.S. Pawn Loan [Member] | Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loan term	30 days
Fair value assumptions, grace period	0 days
U.S. Pawn Loan [Member] | Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loan term	120 days
Fair value assumptions, grace period	90 days
Mexican Pawn Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loan term	30 days
Fair value assumptions, grace period	10 days
Level 2 [Member] | Convertible Debt [Member] | Income approach [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value assumptions, discount rate	7.00%
Level 3 [Member] | Redeemable Noncontrolling Interest [Member] | Income approach [Member] | Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value assumptions, discount rate	5.00%
Level 3 [Member] | Redeemable Noncontrolling Interest [Member] | Income approach [Member] | Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value assumptions, discount rate	10.00%
Level 3 [Member] | Temporary Equity [Member] | Income approach [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value assumptions, discount rate	7.00%
2.125% cash convertible senior notes due 2019 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Redemption value	$ 230.0
All Entities Excluding Grupo Finart [Member] | Consumer Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loan term	12 months
Grupo Finmart [Member] | Consumer Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loan term	30 months