Fair Value Measurements (Tables)

9 Months Ended

Apr. 30, 2015

Fair Value Measurements [Abstract]

Summary of Assets Measured at Fair Value on Recurring Basis

	Level 1 (1)		Level 2 (2)		Level 3 (3)		Total
	(in thousands)
April 30, 2015:
Available-for-sale securities	$	—	$	31,376	$	—	$	31,376
July 31, 2014:
Available-for-sale securities	$	—	$	12,873	$	—	$	12,873

(1) – quoted prices in active markets for identical assets or liabilities

(2) – observable inputs other than quoted prices in active markets for identical assets and liabilities

(3) – no observable pricing inputs in the market