Divestitures - Summary of Components of Income (Loss) from Discontinued Operations (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jul. 01, 2026 |
Jan. 09, 2026 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Operating expenses: | ||||||||||||||||||||
| Income tax (expense) benefit | $ (300.9) | $ (27.9) | $ (1,474.7) | $ (478.1) | ||||||||||||||||
| Discontinued Operations [Member] | ||||||||||||||||||||
| Disposal Group, Including Discontinued Operations [Line Items] | ||||||||||||||||||||
| Net sales | (0.1) | 1,296.0 | 438.1 | 3,347.6 | ||||||||||||||||
| Cost of sales | (25.8) | [1] | 747.1 | [1] | 153.5 | [2] | 1,949.0 | [2] | ||||||||||||
| Gross profit (loss) | 25.7 | 548.9 | 284.6 | 1,398.6 | ||||||||||||||||
| Operating expenses: | ||||||||||||||||||||
| Selling, general and administrative | 6.1 | 154.9 | 129.6 | 438.7 | ||||||||||||||||
| Research and development | 0.0 | 52.7 | 55.7 | 151.5 | ||||||||||||||||
| Amortization of purchased intangible assets | 0.0 | 30.2 | 13.7 | 90.5 | ||||||||||||||||
| Restructuring costs (credits), net | 0.0 | 0.2 | 3.0 | 2.9 | ||||||||||||||||
| Total operating expenses | 6.1 | 238.0 | 202.0 | 683.6 | ||||||||||||||||
| Operating income (loss) | 19.6 | 310.9 | 82.6 | 715.0 | ||||||||||||||||
| Interest expense | 0.0 | [3] | (154.6) | [3] | (129.1) | [4] | (484.4) | [4] | ||||||||||||
| Other income expense, net | 0.9 | (0.9) | (8.2) | [5] | (16.8) | [5] | ||||||||||||||
| Income (loss) from operations of discontinued businesses before income taxes | 20.5 | 155.4 | (54.7) | 213.8 | ||||||||||||||||
| Gain (loss) on disposal of discontinued operations before income taxes | 1,256.3 | (0.2) | 8,265.7 | 869.0 | ||||||||||||||||
| Income tax (expense) benefit | (300.9) | (27.9) | (1,474.7) | (478.1) | ||||||||||||||||
| Income (loss) from discontinued operations, net of income taxes | 975.9 | 127.3 | 6,736.3 | 604.7 | ||||||||||||||||
| Discontinued Operations [Member] | Ruckus [Member] | ||||||||||||||||||||
| Disposal Group, Including Discontinued Operations [Line Items] | ||||||||||||||||||||
| Net sales | 0.0 | 178.5 | 351.0 | 519.7 | ||||||||||||||||
| Cost of sales | 0.1 | [1] | 54.5 | [1] | 120.1 | [2] | 168.4 | [2] | ||||||||||||
| Gross profit (loss) | (0.1) | 124.0 | 230.9 | 351.3 | ||||||||||||||||
| Operating expenses: | ||||||||||||||||||||
| Selling, general and administrative | 6.1 | 48.9 | 117.6 | 139.0 | ||||||||||||||||
| Research and development | 0.0 | 32.0 | 53.8 | 88.3 | ||||||||||||||||
| Amortization of purchased intangible assets | 0.0 | 12.5 | 13.7 | 37.4 | ||||||||||||||||
| Restructuring costs (credits), net | 0.0 | 0.4 | 2.9 | 2.7 | ||||||||||||||||
| Total operating expenses | 6.1 | 93.8 | 188.0 | 267.4 | ||||||||||||||||
| Operating income (loss) | (6.2) | 30.2 | 42.9 | 83.9 | ||||||||||||||||
| Interest expense | 0.0 | [3] | 0.0 | [3] | 0.0 | [4] | 0.0 | [4] | ||||||||||||
| Other income expense, net | 0.7 | 0.2 | 0.6 | [5] | (2.0) | [5] | ||||||||||||||
| Income (loss) from operations of discontinued businesses before income taxes | (5.5) | 30.4 | 43.5 | 81.9 | ||||||||||||||||
| Gain (loss) on disposal of discontinued operations before income taxes | $ 1,258.6 | 1,258.6 | 0.0 | 1,258.6 | 0.0 | |||||||||||||||
| Income tax (expense) benefit | (125.5) | (10.0) | 387.0 | (26.9) | ||||||||||||||||
| Income (loss) from discontinued operations, net of income taxes | 1,127.6 | 20.4 | 1,689.1 | 55.0 | ||||||||||||||||
| Discontinued Operations [Member] | C C S [Member] | ||||||||||||||||||||
| Disposal Group, Including Discontinued Operations [Line Items] | ||||||||||||||||||||
| Net sales | 0.0 | 1,113.4 | 87.4 | 2,712.9 | ||||||||||||||||
| Cost of sales | (25.9) | [1] | 689.9 | [1] | 33.3 | [2] | 1,706.4 | [2] | ||||||||||||
| Gross profit (loss) | 25.9 | 423.5 | 54.1 | 1,006.5 | ||||||||||||||||
| Operating expenses: | ||||||||||||||||||||
| Selling, general and administrative | 0.0 | 103.0 | 11.7 | 275.5 | ||||||||||||||||
| Research and development | 0.0 | 20.7 | 1.9 | 57.1 | ||||||||||||||||
| Amortization of purchased intangible assets | 0.0 | 17.7 | 0.0 | 53.1 | ||||||||||||||||
| Restructuring costs (credits), net | 0.0 | (0.2) | 0.1 | 0.2 | ||||||||||||||||
| Total operating expenses | 0.0 | 141.2 | 13.7 | 385.9 | ||||||||||||||||
| Operating income (loss) | 25.9 | 282.3 | 40.4 | 620.6 | ||||||||||||||||
| Interest expense | 0.0 | [3] | (154.6) | [3] | (129.1) | [4] | (484.4) | [4] | ||||||||||||
| Other income expense, net | 0.4 | (1.1) | (11.1) | [5] | (13.9) | [5] | ||||||||||||||
| Income (loss) from operations of discontinued businesses before income taxes | 26.3 | 126.6 | (99.8) | 122.3 | ||||||||||||||||
| Gain (loss) on disposal of discontinued operations before income taxes | $ 7,006.1 | (2.3) | 0.0 | 7,006.1 | 0.0 | |||||||||||||||
| Income tax (expense) benefit | (175.4) | (21.2) | (1,861.1) | (70.8) | ||||||||||||||||
| Income (loss) from discontinued operations, net of income taxes | (151.4) | 105.4 | 5,045.2 | 51.5 | ||||||||||||||||
| Discontinued Operations [Member] | OWN Segment [Member] | ||||||||||||||||||||
| Disposal Group, Including Discontinued Operations [Line Items] | ||||||||||||||||||||
| Net sales | (0.2) | 0.9 | (0.7) | 90.2 | ||||||||||||||||
| Cost of sales | 0.0 | [1] | 0.0 | [1] | 0.0 | [2] | 49.8 | [2] | ||||||||||||
| Gross profit (loss) | (0.2) | 0.9 | (0.7) | 40.4 | ||||||||||||||||
| Operating expenses: | ||||||||||||||||||||
| Selling, general and administrative | 0.0 | 2.6 | 0.1 | 22.8 | ||||||||||||||||
| Research and development | 0.0 | 0.0 | 0.0 | 3.1 | ||||||||||||||||
| Amortization of purchased intangible assets | 0.0 | 0.0 | 0.0 | 0.0 | ||||||||||||||||
| Restructuring costs (credits), net | 0.0 | 0.0 | 0.0 | 0.0 | ||||||||||||||||
| Total operating expenses | 0.0 | 2.6 | 0.1 | 25.9 | ||||||||||||||||
| Operating income (loss) | (0.2) | (1.7) | (0.8) | 14.5 | ||||||||||||||||
| Interest expense | 0.0 | [3] | 0.0 | [3] | 0.0 | [4] | 0.0 | [4] | ||||||||||||
| Other income expense, net | 0.0 | 0.0 | 0.0 | [5] | (1.1) | [5] | ||||||||||||||
| Income (loss) from operations of discontinued businesses before income taxes | (0.2) | (1.7) | (0.8) | 13.4 | ||||||||||||||||
| Gain (loss) on disposal of discontinued operations before income taxes | 0.0 | (0.2) | 1.0 | 869.0 | ||||||||||||||||
| Income tax (expense) benefit | 0.0 | 3.2 | 0.0 | (382.4) | ||||||||||||||||
| Income (loss) from discontinued operations, net of income taxes | (0.2) | 1.3 | 0.2 | 500.0 | ||||||||||||||||
| Discontinued Operations [Member] | DAS [Member] | ||||||||||||||||||||
| Disposal Group, Including Discontinued Operations [Line Items] | ||||||||||||||||||||
| Net sales | 0.0 | 11.7 | ||||||||||||||||||
| Cost of sales | [2] | 0.0 | 10.0 | |||||||||||||||||
| Gross profit (loss) | 0.0 | 1.7 | ||||||||||||||||||
| Operating expenses: | ||||||||||||||||||||
| Selling, general and administrative | 0.0 | 3.4 | ||||||||||||||||||
| Research and development | 0.0 | 3.0 | ||||||||||||||||||
| Amortization of purchased intangible assets | 0.0 | 0.0 | ||||||||||||||||||
| Restructuring costs (credits), net | 0.0 | 0.0 | ||||||||||||||||||
| Total operating expenses | 0.0 | 6.4 | ||||||||||||||||||
| Operating income (loss) | 0.0 | (4.7) | ||||||||||||||||||
| Interest expense | [4] | 0.0 | 0.0 | |||||||||||||||||
| Other income expense, net | [5] | 0.0 | 0.0 | |||||||||||||||||
| Income (loss) from operations of discontinued businesses before income taxes | 0.0 | (4.7) | ||||||||||||||||||
| Gain (loss) on disposal of discontinued operations before income taxes | 0.0 | 0.0 | ||||||||||||||||||
| Income tax (expense) benefit | 0.0 | 2.0 | ||||||||||||||||||
| Income (loss) from discontinued operations, net of income taxes | 0.0 | (2.7) | ||||||||||||||||||
| Discontinued Operations [Member] | Home Segment [Member] | ||||||||||||||||||||
| Disposal Group, Including Discontinued Operations [Line Items] | ||||||||||||||||||||
| Net sales | 0.1 | 3.2 | 0.4 | 13.1 | ||||||||||||||||
| Cost of sales | 0.0 | [1] | 2.7 | [1] | 0.1 | [2] | 14.4 | [2] | ||||||||||||
| Gross profit (loss) | 0.1 | 0.5 | 0.3 | (1.3) | ||||||||||||||||
| Operating expenses: | ||||||||||||||||||||
| Selling, general and administrative | 0.0 | 0.4 | 0.2 | (2.0) | ||||||||||||||||
| Research and development | 0.0 | 0.0 | 0.0 | 0.0 | ||||||||||||||||
| Amortization of purchased intangible assets | 0.0 | 0.0 | 0.0 | 0.0 | ||||||||||||||||
| Restructuring costs (credits), net | 0.0 | 0.0 | 0.0 | 0.0 | ||||||||||||||||
| Total operating expenses | 0.0 | 0.4 | 0.2 | (2.0) | ||||||||||||||||
| Operating income (loss) | 0.1 | 0.1 | 0.1 | 0.7 | ||||||||||||||||
| Interest expense | 0.0 | [3] | 0.0 | [3] | 0.0 | [4] | 0.0 | [4] | ||||||||||||
| Other income expense, net | (0.2) | 0.0 | 2.3 | [5] | 0.2 | [5] | ||||||||||||||
| Income (loss) from operations of discontinued businesses before income taxes | (0.1) | 0.1 | 2.4 | 0.9 | ||||||||||||||||
| Gain (loss) on disposal of discontinued operations before income taxes | 0.0 | 0.0 | 0.0 | 0.0 | ||||||||||||||||
| Income tax (expense) benefit | 0.0 | 0.1 | (0.6) | 0.0 | ||||||||||||||||
| Income (loss) from discontinued operations, net of income taxes | $ (0.1) | $ 0.2 | $ 1.8 | $ 0.9 | ||||||||||||||||
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