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Debt - Additional Information (Detail)
 3 Months Ended
Jun. 26, 2017
USD ($)
Acquisition
shares
Jun. 20, 2017
USD ($)
Day
$ / shares
shares
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2016
USD ($)
Jul. 31, 2017
USD ($)
Jun. 30, 2017
shares
Jun. 24, 2017
USD ($)
Debt Instrument [Line Items]              
Number of shares of common stock repurchase | shares     27,639,876     25,941,476  
Number of business acquisitions provided with additional cash resources | Acquisition 2            
Remaining debt issuance costs expensed     $ 1,300,000 $ 300,000      
Debt issuance cost     $ 1,100,000        
Percentage of voting capital stock     65.00%        
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Outstanding principal amount             $ 100,000,000
0.50% Convertible Senior Notes due 2022 [Member]              
Debt Instrument [Line Items]              
Debt instrument aggregate principal amount     $ 525,000,000        
Credit Agreement [Member]              
Debt Instrument [Line Items]              
Outstanding principal amount             220,000,000
Credit Agreement [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of credit facility amount         $ 250,000,000   450,000,000
Amendment and Restatement Agreement [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt amortization period     60 months        
Outstanding principal amount     $ 0        
Line of credit facility amount     200,000,000        
Line of credit facility allowable requests for additional borrowing     $ 100,000,000        
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 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 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        
Purchase Agreement [Member] | 0.50% Convertible Senior Notes due 2022 [Member] | Wells Fargo Securities, LLC [Member]              
Debt Instrument [Line Items]              
Debt instrument aggregate principal amount   $ 500,000,000          
Debt instrument additional aggregate principal amount   $ 25,000,000          
Option to purchase additional principal amount of notes granted to initial purchasers, period   30 days          
Net proceeds from issuance of convertiable debt $ 514,500,000            
Number of shares of common stock repurchase | shares 1,698,400            
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     $ 8,700,000        
Unamortized amounts of debt discount     78,200,000        
Term Loan Arrangement [Member]              
Debt Instrument [Line Items]              
Outstanding principal amount             $ 120,000,000
Term Loan Arrangement [Member] | Amendment and Restatement Agreement [Member]              
Debt Instrument [Line Items]              
Remaining debt issuance costs expensed     $ 1,000,000