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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2014 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2014 | Dec. 31, 2016 | Feb. 21, 2017
Stockholders Equity [Line Items] |  |  |  |  |  |
Share repurchase program authorized amount |  |  |  |  |  | $ 1,500.0
Share repurchase program, remaining authorized capacity |  |  |  |  | $ 232.9 |
Share repurchase program expiration date |  | Feb. 21, 2020 |  |  | Jun. 30, 2017 |
Retained earnings (accumulated deficit) |  | $ 48.4 |  |  | $ (66.3) |
Additional paid-in-capital |  | (469.2) |  |  | $ (467.6) |
Repurchase of common stock, value |  | $ 68.2 | $ 2.3 |  |  |
Treasury stock shares, at cost |  | 1,100,000 |  |  |  |
Shares repurchases, value |  | $ 60.7 | 0.0 |  |  |
Withheld for tax purpose for share-based compensation plans |  | 7.5 | 2.3 |  |  |
Share repurchases recorded amount |  | 58.1 | 2.3 |  |  |
Liability for unsettled share repurchases |  | 10.1 |  |  |  |
Other comprehensive income (loss) before foreign currency translation adjustments reclassifications, Tax expense (benefits) |  | 2.6 | (0.8) |  |  |
Other comprehensive Unrealized Gain (Loss) on Derivatives before reclassifications, Tax expense (benefits) |  |  | (0.2) |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to income, tax expense (benefits) unrealized gain (loss) on available-for-sale investments |  |  | 0.1 |  |  |
Capped call transactions [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Capped call transactions with financial institutions | $ 123.8 |  |  |  |  |
Capped call transactions price per common share | $ 120.79 |  |  |  |  |
Increase (decrease) in additional paid-in capital, other |  |  |  | $ (123.8) |  |
Capped call transactions [Member] | Convertible Notes [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Convertible notes initial conversion price | $ 86.28 |  |  |  |  |
Prepaid forward share repurchase transactions [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Share repurchase program, remaining authorized capacity |  | $ 1,439.3 |  |  |  |
Forward share repurchase transactions amount | $ 685.8 |  |  | 685.8 |  |
Share repurchase transaction, shares to be purchased | 9,900,000 |  |  |  |  |
Average cost per share of shares repurchased | $ 69.02 |  |  |  |  |
Settlement date of forward transactions |  | Aug. 15, 2019 |  |  |  |
Retained earnings (accumulated deficit) |  |  |  | (653.9) |  |
Additional paid-in-capital |  |  |  | (31.9) |  |
Non-cash forward transaction issuance costs |  |  |  | $ 35.8 |  |
Non-cash interest expense relating to amortization of non-cash issuance costs |  | $ 1.6 | $ 1.6 |  |  |
Open market purchases [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Average cost per share of shares repurchased |  | $ 56.10 |  |  |  |
Repurchase of common stock, shares |  | 1,100,000 | 0 |  |  |
Repurchase of common stock, value |  | $ 60.7 |  |  |  |
Treasury stock shares, at cost |  | 1,100,000 |  |  |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. + References Reference 1: 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(a)(23)(a)(4)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: 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(30)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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