Fair Value - Additional Information (Detail) CAD in Millions	3 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 CAD	Dec. 31, 2013 USD ($)
Fair Value Of Financial Instruments [Line Items]
Net asset stable value for public traded funds		$ 1
Contingent consideration arising from acquisitions, payment or settlement	$ 2,100,000
Copal [Member]
Fair Value Of Financial Instruments [Line Items]
Contingent consideration arising from acquisitions, payment or settlement	4,300,000			$ 2,500,000
Payments to acquire remaining shares	$ 12,200,000
Remaining ownership interest		33.00%
CSI Global Education, Inc. [Member]
Fair Value Of Financial Instruments [Line Items]
Contingent consideration arising from acquisitions, payment or settlement | CAD			CAD 2.5