Corporate Investments and Funds Held For Clients - Reconciliation (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Corporate Investments and Funds Held for Clients
Amortized cost of cash and cash equivalents	$ 114,323	$ 132,478
Cash and cash equivalents, gross unrealized gains	3
Cash and cash equivalents, gross unrealized losses	(1)	(2)
Fair value of cash and cash equivalents	114,325	132,476	$ 90,856
Amortized cost of funds held for clients' cash and cash equivalents	1,520,105	1,293,673
Funds held for clients' cash and cash equivalents, gross unrealized gains	23
Funds held for clients' cash and cash equivalents, gross unrealized losses	(1)	(6)
Fair value of funds held for clients' cash and cash equivalents	1,520,127	1,293,667	$ 1,596,719
Available-for-sale securities
Amortized cost	281,889	130,665
Gross unrealized gains	287	168
Gross unrealized losses	(448)	(9)
Fair value	281,728	130,824
Total investments at amortized cost	1,916,317	1,556,816
Total investments gross unrealized gain	313	168
Total investments gross unrealized loss	(450)	(17)
Total investments at fair value	1,916,180	1,556,967
Commercial paper
Available-for-sale securities
Amortized cost	150,388	63,397
Gross unrealized gains	50	33
Gross unrealized losses	(1)	(2)
Fair value	150,437	63,428
Corporate bonds
Available-for-sale securities
Amortized cost	52,587	27,044
Gross unrealized gains	18	59
Gross unrealized losses	(357)	(4)
Fair value	52,248	27,099
Asset-backed securities
Available-for-sale securities
Amortized cost	57,612	26,488
Gross unrealized gains	64	55
Gross unrealized losses	(90)	(3)
Fair value	57,586	26,540
U.S. treasury securities
Available-for-sale securities
Amortized cost	21,302	13,736
Gross unrealized gains	155	21
Fair value	21,457	13,757
Corporate investments
Available-for-sale securities
Fair value	72,679	30,022
Funds held for clients
Available-for-sale securities
Fair value	$ 209,049	$ 100,802