Fair Value Measurement (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018
Fair value measurement
Cash and cash equivalents	$ 63,662	$ 137,193
Funds held for clients' cash and cash equivalents	1,046,691	1,102,538
Total investments at fair value	1,253,948	1,363,539
Available-for-sale securities:
Available for sale securities	143,595	123,808
Fair value asset transfers
Transfers from level 1 to level 2	0
Transfers from level 2 to level 1	0
Amount of prepaid expenses and other reclassified to corporate investments for comparability		732
Level 1
Fair value measurement
Cash and cash equivalents	60,215	137,193
Funds held for clients' cash and cash equivalents	1,018,208	1,076,414
Total investments at fair value	1,078,423	1,213,607
Level 2
Fair value measurement
Cash and cash equivalents	3,447
Funds held for clients' cash and cash equivalents	28,483	26,124
Total investments at fair value	175,525	149,932
Available-for-sale securities:
Available for sale securities	143,595	123,808
Level 3
Available-for-sale securities:
Available for sale securities	0
Commercial paper
Available-for-sale securities:
Available for sale securities	56,634	50,702
Commercial paper \| Level 2
Available-for-sale securities:
Available for sale securities	56,634	50,702
Corporate bonds
Available-for-sale securities:
Available for sale securities	32,188	37,382
Corporate bonds \| Level 2
Available-for-sale securities:
Available for sale securities	32,188	37,382
Asset-backed securities
Available-for-sale securities:
Available for sale securities	38,671	25,847
Asset-backed securities \| Level 2
Available-for-sale securities:
Available for sale securities	38,671	25,847
U.S. treasury securities
Available-for-sale securities:
Available for sale securities	16,102	9,877
U.S. treasury securities \| Level 2
Available-for-sale securities:
Available for sale securities	$ 16,102	$ 9,877

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

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Amount of prepaid expenses and other reclassified to corporate investments on the consolidated balance sheets for comparability purposes.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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