Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) Client	Mar. 31, 2018 Client	Mar. 31, 2019 USD ($) Client	Mar. 31, 2018 Client	Jun. 30, 2018 USD ($) Client
Summary Of Significant Accounting Policies [Line Items]
Money market funds | $	$ 11.1		$ 11.1		$ 10.9
Restricted cash as collateral for letters of credit | $	0.0		0.0		$ 0.9
AmOne Corp [Member]
Summary Of Significant Accounting Policies [Line Items]
Business combination, post-closing payments | $	$ 7.7		$ 7.7
Customer Concentration Risk [Member] | Net revenue [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of clients accounted for more than 10% of net revenue	1	1	1	1
Concentration risk percentage accounted by major clients	23.00%	22.00%	23.00%	23.00%
Number of other clients accounted for more than 10% of net revenue	0	0	0	0
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of other clients accounted for more than 10% of net accounts receivable			0		0
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Client Two [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage accounted by major clients			16.00%		13.00%
Number of clients accounted for 10% or more than 10% of net accounts receivable			1		1
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Client One [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage accounted by major clients					13.00%
Number of clients accounted for more than 10% of net accounts receivable					1