Fair Value Measurements (Tables)

6 Months Ended

Jan. 31, 2017

Fair Value Measurements [Abstract]

Summary of balance of assets and liabilities measured at fair value on a recurring basis

	Level 1 (1)		Level 2 (2)		Level 3 (3)		Total
	(in thousands)
January 31, 2017
Assets:
Available-for-sale securities	$	10,627	$	42,646	$	—	$	53,273
July 31, 2016
Assets:
Available-for-sale securities	$	12,445	$	40,504	$	—	$	52,949

(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