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Financing Arrangements - 2022 Term Loan - Additional Information (Detail) - Term Loan [Member] - 2022 Term Loan [Member] - USD ($)
$ in Millions
6 Months Ended
Oct. 01, 2015
Mar. 31, 2019
Debt Instrument [Line Items]    
Long-term line of credit $ 450.0  
Debt instrument paid off date Jan. 02, 2018  
Write off of debt issuance costs $ 0.7  
Debt Instrument, Frequency of Periodic Payment   quarterly
Debt Instrument, Periodic Payment $ 1.1  
Debt instrument maturity date Oct. 01, 2022