Corporate Investments and Funds Held For Clients - Reconciliation (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020
Corporate Investments and Funds Held for Clients
Amortized cost of cash and cash equivalents	$ 66,431	$ 202,287
Fair value of cash and cash equivalents	66,431	202,287	$ 221,514
Amortized cost of funds held for clients' cash and cash equivalents	3,042,121	1,743,594
Fair value of funds held for clients' cash and cash equivalents	3,042,121	1,743,594	$ 1,314,876
Available-for-sale securities
Amortized cost	146,563	20,452
Gross unrealized gains	36	87
Gross unrealized losses	(49)
Fair value	146,550	20,539
Total investments at amortized cost	3,255,115	1,966,333
Total investments gross unrealized gains	36	87
Total investments gross unrealized losses	(49)
Total investments at fair value	3,255,102	1,966,420
Commercial paper
Available-for-sale securities
Amortized cost	70,166
Gross unrealized gains	5
Gross unrealized losses	(1)
Fair value	70,170
Corporate bonds
Available-for-sale securities
Amortized cost	44,305	13,390
Gross unrealized gains	24	70
Gross unrealized losses	(26)
Fair value	44,303	13,460
Asset-backed securities
Available-for-sale securities
Amortized cost	7,836	7,062
Gross unrealized gains	5	17
Gross unrealized losses	(1)
Fair value	7,840	7,079
Certificates of deposit
Available-for-sale securities
Amortized cost	15,376
Gross unrealized gains	2
Fair value	15,378
U.S government agency securities
Available-for-sale securities
Amortized cost	7,000
Gross unrealized losses	(18)
Fair value	6,982
Other
Available-for-sale securities
Amortized cost	1,880
Gross unrealized losses	(3)
Fair value	1,877
Corporate investments
Available-for-sale securities
Fair value	3,151	4,456
Funds held for clients
Available-for-sale securities
Fair value	$ 143,399	$ 16,083

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The amount of funds held for clients that are cash and cash equivalents.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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