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Long Term Debt - Additional Information (Detail) - USD ($)		3 Months Ended
	Jul. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 23, 2016
Debt Instrument [Line Items]
Aggregate principal amount of loan		$ 260,100,000		$ 10,000,000
Long term debt, net		258,000,000		$ 9,300,000
Principal repayment		40,000,000	$ 25,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal repayment		$ 40,000,000
Revolving Credit Facility [Member] | Amendment to Credit Agreement [Member]
Debt Instrument [Line Items]
Aggregate principal amount of loan	$ 300,000,000
Upfront fees	1,800,000
Debt issuance costs	300,000
Long term debt, net	297,900,000
Scheduled principal payments prior to maturity date	$ 0
Revolving Credit Facility [Member] | Counsyl Inc [Member] | Amendment to Credit Agreement [Member]
Debt Instrument [Line Items]
Loan agreement, maturity date	Jul. 31, 2023
Loans maximum borrowing capacity	$ 350,000,000				$ 300,000,000

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- Definition

Amount of the total principal payments made during the annual reporting period.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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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, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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