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DERIVATIVE FINANCIAL INSTRUMENTS, Balance Sheet Location (Details) CAD in Thousands, $ in Thousands	Mar. 31, 2016 USD ($)	Mar. 31, 2016 CAD	Sep. 30, 2015 USD ($)	Sep. 30, 2015 CAD
Designated as hedging instrument \| Forward foreign exchange contracts \| Prepaid expenses and other assets
Derivative assets [Abstract]
Notional amount \| CAD		CAD 768,800		CAD 752,600
Fair value	$ 2,257		$ 613
Designated as hedging instrument \| Forward foreign exchange contracts \| Trade and other payables
Liabilities derviatives [Abstract]
Notional amount		100,400	0
Fair value	84		0
Designated as hedging instrument \| Interest rate contract
Liabilities derviatives [Abstract]
Fair value	20,803
Designated as hedging instrument \| Interest rate contract \| Trade and other payables
Liabilities derviatives [Abstract]
Notional amount	450,000		300,000
Fair value	20,803		7,545
Derivatives not designated as hedging instruments \| Forward foreign exchange contracts \| Prepaid expenses and other assets
Derivative assets [Abstract]
Notional amount \| CAD		181,000		214,300
Fair value	681		304
Derivatives not designated as hedging instruments \| Forward foreign exchange contracts \| Trade and other payables
Liabilities derviatives [Abstract]
Notional amount		139,300	0
Fair value	117		0
Derivatives not designated as hedging instruments \| Forward foreign exchange contracts \| Trading instruments
Derivative assets [Abstract]
Notional amount \| CAD		108,462		74,873
Fair value	9,677		2,612
Derivatives not designated as hedging instruments \| Forward foreign exchange contracts \| Trading instruments sold
Liabilities derviatives [Abstract]
Notional amount \| CAD		CAD 119,856		CAD 136,710
Fair value	4,939		4,865
Derivatives not designated as hedging instruments \| Interest rate contract
Liabilities derviatives [Abstract]
Fair value			7,545
Derivatives not designated as hedging instruments \| Interest rate contract \| Trading instruments
Derivative assets [Abstract]
Notional amount	1,940,004		2,473,946
Fair value	138,228		130,095
Derivatives not designated as hedging instruments \| Interest rate contract \| Derivative instruments associated with offsetting matched book positions
Derivative assets [Abstract]
Notional amount	1,507,020		1,649,863
Fair value	396,163		389,457
Liabilities derviatives [Abstract]
Notional amount	1,507,020		1,649,863
Fair value	396,163		389,457
Derivatives not designated as hedging instruments \| Interest rate contract \| Trading instruments sold
Liabilities derviatives [Abstract]
Notional amount	1,928,733		1,906,766
Fair value	$ 130,702		$ 104,255