Derivatives and Hedging (Details) - Interest Rate Swap $ in Thousands	3 Months Ended
	Oct. 31, 2015 USD ($) Derivative	Oct. 31, 2014 USD ($)	Jul. 31, 2015 USD ($)
Derivative [Line Items]
Number of interest rate derivatives held | Derivative	2
Derivative, type of instrument	Interest rate swap
Reclassification adjustment out of other comprehensive income into interest expense	$ 300	$ 500
Description of interest rate cash flow hedge accounting method	Hypothetical derivative method
Other liabilities
Derivative [Line Items]
Interest rate swap derivative	$ 156		$ 446