Fair Value Measurements (Tables)

12 Months Ended

Jul. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of balance of assets measured at fair value on a recurring basis

(in thousands)	Level 1		Level 2		Level 3		Total
July 31, 2019
Debt securities	$	—	$	2,534	$	—	$	2,534
Equity investments included in current assets		5,688		—		—		5,688
Equity investments included in noncurrent assets		—		—		3,619		3,619
TOTAL	$	5,688	$	2,534	$	3,619	$	11,841
July 31, 2018
Debt securities	$	1,692	$	3,920	$	—	$	5,612
Equity investments included in current assets		360		—		—		360
TOTAL	$	2,052	$	3,920	$	—	$	5,972

Schedule of assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)

Year ended July 31,
(in thousands)	2019		2018			2017
Balance, beginning of period	$	—	$	6,300		$	2,000
Transfer into Level 3 from adoption of change in accounting for equity investments		2,793		—			—
Total gains included in "Other income (expense), net"		826		—			—
Total gains included in other comprehensive income		—		—			2,100
Purchases		—		—			2,200
Rafael Spin-Off		—		(6,300	)		—
BALANCE, END OF PERIOD	$	3,619	$	—		$	6,300
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the period	$	826	$	—		$	—