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Restructuring Charges - Charges Taken Related to Restructuring Actions (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2017 | Apr. 01, 2017 | Mar. 31, 2018 | Sep. 30, 2017
Bedford [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Facility closure costs | $ 1.3 | $ 3.5 |  |
Restructuring | Two Thousand Seventeen [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Workforce reductions |  |  |  | $ 8.5
Facility closure costs |  |  |  | 4.8
Fiscal restructuring charges |  |  |  | 13.3
Restructuring | Two thousand eighteen [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Workforce reductions |  |  | $ 5.6 |
Fiscal restructuring charges |  |  | 5.6 |
Restructuring | Fiscal 2018 Action [Member] | Two Thousand Seventeen [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Workforce reductions |  |  |  | 0.0
Facility closure costs |  |  |  | 0.0
Fiscal restructuring charges |  |  |  | 0.0
Restructuring | Fiscal 2018 Action [Member] | Two thousand eighteen [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Workforce reductions |  |  | 5.6 |
Fiscal restructuring charges |  |  | 5.6 |
Restructuring | Fiscal 2017 Actions [Member] | Two Thousand Seventeen [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Workforce reductions |  |  |  | 8.5
Facility closure costs |  |  |  | 0.0
Fiscal restructuring charges |  |  |  | 8.5
Restructuring | Fiscal 2017 Actions [Member] | Two thousand eighteen [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Workforce reductions |  |  | 0.0 |
Fiscal restructuring charges |  |  | 0.0 |
Restructuring | Fiscal 2016 Actions | Two Thousand Seventeen [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Workforce reductions |  |  |  | 0.0
Facility closure costs |  |  |  | 4.8
Fiscal restructuring charges |  |  |  | $ 4.8
Restructuring | Fiscal 2016 Actions | Two thousand eighteen [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Workforce reductions |  |  | 0.0 |
Fiscal restructuring charges |  |  | $ 0.0 |

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- Definition Represents charges incurred to close or restructure a facility in connection with an exit or disposal activity. Such costs include clean-up costs and lease obligations. Costs are recorded as the activities are incurred except for lease obligation charges, which are recorded upon termination of the lease obligation or at the cease use date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents severance and related benefit charges for the termination of employees under an exit or disposal activity. Charges are recorded either as one-time termination benefits, which are recognized ratable over the required service period to receive such benefit, or under an ongoing benefit plan arrangement once the charge is probable and reasonably estimable. + References No definition available. + Details
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- Definition Total restructuring charges under exit or disposal plan. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition 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. + References No definition available. + Details
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- Details
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