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Debt - Additional Information (Detail)
 9 Months Ended
Mar. 31, 2019
USD ($)
Day
$ / shares
shares
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Debt Instrument [Line Items]      
Debt issuance cost   $ 1,100,000  
Percentage of voting capital stock 65.00%    
0.50% Convertible Senior Notes due 2022 [Member]      
Debt Instrument [Line Items]      
Debt instrument aggregate principal amounts $ 525,000,000    
Net proceeds from issuance of convertible debt $ 514,500,000    
Interest rates on borrowings 0.50%    
Debt instrument maturity date Jun. 15, 2022    
Conversion of notes in multiples of principal amounts $ 1,000    
Convertible number of shares, principal amount of notes | shares 13.6947    
Initial conversion price per share of common stock | $ / shares $ 73.02    
Note repurchase price, percentage of principal amount of notes 100.00%    
Sale price of common stock, minimum threshold percentage 130.00%    
Sale of common stock, threshold trading days | Day 20    
Sale of common stock, threshold consecutive trading days | Day 30    
Equity component of the principal amount of the convertible debt $ 82,100,000    
Nonconvertible debt borrowing rate 4.39%    
Debt instrument term 5 years    
Debt issuance costs $ 11,100,000    
Initial purchaser’s discount 10,500,000    
Legal, accounting, and printing costs 579,000    
Convertible debt issuance costs pro rata to equity components 1,900,000    
Convertible debt issuance costs pro rata to debt components $ 9,200,000    
Debt amortization period 5 years    
Unamortized amounts of debt issuance costs $ 6,100,000    
Unamortized amounts of debt discount $ 55,000,000    
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Debt amortization period 60 months    
Line of credit facility amount     $ 200,000,000
Line of credit facility allowable requests for additional borrowing     100,000,000
Outstanding principal amount $ 0    
Maturity period Sep. 27, 2022    
Repayment date, description The revolving credit facility is required to be repaid in full on the earlier of (i) September 27, 2022, and (ii) the date 91 days prior to the Maturity Date of the Notes if the Notes have not been refinanced in full by such date.    
Debt issuance cost $ 2,300,000    
Description of base rate The revolving credit facility bears interest at our election of a Base Rate plus an Applicable Margin or LIBOR plus an Applicable Margin. Swingline loans bear interest at a Base Rate plus an Applicable Margin. The Base Rate is a floating rate that is the greater of the Prime Rate, the Federal Funds Rate plus 50 basis points, or LIBOR plus 100 basis points. The Applicable Margin is based on a sliding scale which ranges from 0.25 to 100 basis points for Base Rate loans and 100 basis points to 175 basis points for LIBOR loans.    
Covenant description Under the Agreement, there are various restrictive covenants, including three financial covenants which limit the consolidated total leverage ratio, or leverage ratio, the consolidated interest coverage ratio, or interest coverage ratio, a restriction which places a limit on the amount of capital expenditures that may be made in any fiscal year, a restriction that permits up to $50 million per fiscal quarter of accounts receivable financings, and sets the Specified Leverage Ratio. The leverage ratio is the ratio of debt as of the measurement date to earnings before interest, taxes, depreciation and amortization, or EBITDA, for the four consecutive quarters ending with the quarter of measurement. The current leverage ratio shall not exceed 3.50 to 1.00 provided that for the four fiscal quarters ending after the date of a material acquisition, such maximum leverage ratio shall be adjusted to 3.75 to 1.00, and thereafter, shall not be more than 3.50 to 1.00. The interest coverage ratio is EBITDA to interest expense for the four consecutive quarters ending with the quarter of measurement. The interest coverage ratio must not be less than 3.50 to 1.0 during the term of the Agreement. The Specified Leverage Ratio is the ratio used in determining, among other things, whether we are permitted to make dividends and/or prepay certain indebtedness, at a fixed ratio of 3.00 to 1.00. As of the end of the fiscal quarter, we were in compliance with the restrictive covenants    
Maximum accounts receivable financings per quarter $ 50,000,000    
Maximum leverage ratio permitted 3.50%    
Minimum interest coverage ratio 3.50%    
Fixed coverage ratio 3.00%    
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member] | For The First Four Fiscal Quarters Ending After Date of Material Acquisition [Member]      
Debt Instrument [Line Items]      
Maximum leverage ratio permitted 3.75%    
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member] | Thereafter [Member]      
Debt Instrument [Line Items]      
Maximum leverage ratio permitted 3.50%    
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member] | Federal Funds Rates [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.50%    
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Commitment fee percentage of unused portion 0.175%    
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.0025%    
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Commitment fee percentage of unused portion 0.25%    
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.75%    
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
Amendment and Restatement Agreement [Member] | Letter of Credit [Member]      
Debt Instrument [Line Items]      
Line of credit facility amount     20,000,000
Amendment and Restatement Agreement [Member] | Bridge Loan [Member]      
Debt Instrument [Line Items]      
Line of credit facility amount     $ 20,000,000