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Shareholders’ Equity - Issuances (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Sep. 15, 2016 vesting_installment $ / shares shares	Mar. 09, 2016 director $ / shares shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of Common Shares | $			$ 91	$ 0	$ 0
General and administrative expense | $			25,129	26,535	21,957
Compensation and benefits expense | $			$ 91,985	$ 83,456	$ 127,841
2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance (in shares)			517,568
2016 Plan | Class A common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares acquired through withholding process (in shares)			(2,268)
Shares acquired through withholding process aggregate value | $			$ (91)
2016 Plan | Managing Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of directors | director		3
2016 Plan | Managing Director | Class A common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	77,200	2,500
Shares granted (in dollars per share) | $ / shares	$ 37.84	$ 23.27
2016 Plan | Officers and Employees | Class A common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	72,200
Number of vesting installments | vesting_installment	5
2016 Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased			2,268
Number of shares nonvested (in shares)			57,760	0
Number of shares vested (in shares)			24,672
Estimated future compensation expense | $			$ 2,186
Weighted average period compensation expense will be recorded (in years)			24 months
General and administrative expense | $			$ 364
Compensation and benefits expense | $			$ 569
2016 Plan | RMR LLC | Class A common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased			2,268
2016 Plan | RMR LLC | Managing Director | Class A common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		7,500
Tranche One | 2016 Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested (in shares)			14,440
Tranche Two | 2016 Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested (in shares)			14,440,000
Tranche Three | 2016 Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested (in shares)			14,440,000
Tranche Four | 2016 Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested (in shares)			14,440,000

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