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Debt (Details) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 15, 2019 | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) bank | Sep. 30, 2014 USD ($) | Jul. 02, 2016 USD ($) | May 31, 2016 USD ($) | Apr. 02, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior Notes |  | $ 500,000,000 | $ 0 |  |  | $ 500,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.00% |
Debt Instrument, Fair Value Disclosure |  | $ 536,300,000 |  |  |  |  |
Additional borrowing capacity on credit facility if agreed to by lenders |  |  |  |  | $ 500,000,000 |  |
Voting interest in domestic subsidiaries pledged against credit facility |  | 100.00% |  |  |  |  |
Credit facility, borrowings outstanding |  | $ 758,125,000 | 618,125,000 |  |  |  |
Voting interest in foreign subsidiaries pledged against credit facility |  | 65.00% |  |  |  |  |
Investment limit in foreign subsidiaries |  | $ 75,000,000 |  |  |  |  |
Cash investment limit for acquisition of business |  | $ 200,000,000 |  |  |  |  |
Maximum leverage ratio allowed under debt covenant |  | 4.00 |  |  |  |  |
Minimum fixed charge coverage ratio allowed under debt covenant |  | 3.50 |  |  |  |  |
Leverage ratio, actual |  | 3.55 |  |  |  |  |
Debt Instrument, Covenant Compliance, Senior Debt Leverage Ratio, actual |  | 1.18 |  |  |  |  |
Fixed charge coverage ratio, actual |  | 7.14 |  |  |  |  |
Credit facility, origination costs |  | $ 6,900,000 |  | $ 7,900,000 |  |  |
Credit facility, periodic interest payment |  | $ 13,300,000 | $ 10,100,000 | $ 5,700,000 |  |  |
Credit facility, average interest rate during period |  | 3.00% | 1.70% | 1.60% |  |  |
Long-term Debt, Gross |  | $ 758,125,000 | $ 668,125,000 |  |  |  |
Unamortized Debt Issuance Expense |  | (10,709,000) | (7,587,000) |  |  |  |
debt net of unamortized debt issuance cost |  | 747,416,000 | 660,538,000 |  |  |  |
Current portion of long term debt |  | $ 0 | $ 50,000,000 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, variable interest rate, length of time between updates |  | 180 days |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, variable interest rate, length of time between updates |  | 30 days |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of banks in credit agreement | bank |  |  | 16 |  |  |  |
Credit facility, borrowings outstanding |  | $ 0 | $ 475,000,000 |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, current maximum amount |  |  |  |  |  |  | $ 1,000,000,000
Credit facility, borrowings outstanding |  | $ 258,125,000 | $ 193,125,000 |  |  |  |
Credit facility, revolving loan, basis spread on federal funds effective rate |  | 0.50% |  |  |  |  |
Credit facility, revolving loan, basis spread on adjusted LIBOR |  | 1.00% |  |  |  |  |
Debt Instrument, Covenant Compliance, Senior Debt Leverage Ratio |  | 3.0 |  |  |  |  |
Line of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, revolving loan, commitment fees percentage |  | 0.30% |  |  |  |  |
Line of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, revolving loan, commitment fees percentage |  | 0.175% |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, current maximum amount |  |  |  |  | $ 900,000,000 |  |
LIBOR for Eurodollar-Based Borrowings [Member] | Line of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |  |  |  |  |
LIBOR for Eurodollar-Based Borrowings [Member] | Line of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |  |  |  |
Base Rate [Member] | Line of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.75% |  |  |  |  |
Base Rate [Member] | Line of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.25% |  |  |  |  |
Revolving Loan, Reset December 17, 2015 | Term Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, term loan, interest rate at period end |  | 2.56% |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 101.00% |  |  |  |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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