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Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
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Apr. 27, 2018 shares | Oct. 05, 2016 shares | Feb. 26, 2014 $ / shares | Apr. 29, 2018 USD ($) $ / shares shares | Apr. 30, 2017 $ / shares | Jan. 27, 2019 USD ($) employee $ / shares shares | Jan. 28, 2018 $ / shares shares | Jan. 29, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized per the equity incentive plan |  |  |  |  |  |  | 17,031,653 |  |  |  |  |
Aggregate unrecognized compensation for stock options | $ |  |  |  |  |  |  | $ 3,200 |  |  |  |  |
Potential per share consideration due upon change in control | $ / shares |  |  |  |  |  |  | $ 40.00 |  |  |  |  |
Number of employees affected by modification of awards | employee |  |  |  |  |  |  | 8 |  |  |  |  |
Number of shares affected (in shares) |  |  |  |  | 159,000 |  |  |  |  |  |  |
Additional compensation cost | $ |  |  |  |  | $ 2,800 |  |  |  |  |  |  |
Maximum number of shares subject to purchase under warrants |  |  | 1,086,957 |  |  |  |  |  |  |  |  |
Number of shares underlying the Warrant that vested |  | 586,956 |  |  |  |  |  |  |  |  |  |
Warrant vesting costs | $ |  |  |  |  |  |  | $ 21,500 |  |  |  |  |
Warrant vesting costs due to acceleration | $ |  |  |  |  |  |  | $ 15,900 |  |  |  |  |
Number of securities called by warrants (in shares) |  |  |  |  |  |  | 869,565 |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  |  |  | 0.00% |  | 0.00% |  | 0.00% |
Period over which aggregate unrecognized compensation will be recognized |  |  |  |  |  |  | 2 years 12 months |  |  |  |  |
Performance-based RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Performance period |  |  |  |  |  |  | 3 years |  |  |  |  |
Maximum number of shares which would be settled in shares |  |  |  |  |  |  | 187,116 |  |  |  |  |
Remaining value of shares which would be settled in cash (in shares) |  |  |  |  |  |  | 187,116 |  |  |  |  |
Target performance metrics for performance unit awards, fiscal year 2017 |  |  |  |  |  |  | 180.80% |  |  |  |  |
Aggregate unrecognized compensation | $ |  |  |  |  |  |  | $ 6,800 |  |  |  |  |
Period over which aggregate unrecognized compensation will be recognized |  |  |  |  |  |  | 1 year 3 months |  |  |  |  |
Weighted average fair value units granted (in dollars per share) | $ / shares | [1] |  |  |  |  |  | $ 32.93 |  | $ 39.55 |  | $ 17.51 |
Stock units granted (in shares) |  |  |  |  | 200,442 |  | 287,000 | [1] | 215,857 | [1] | 231,000 | [1]
Description of award vesting rights |  |  |  |  |  |  | one-third of the awards vesting each performance period |  |  |  |  |
Percent of performance achievement of target for vested awards |  |  |  |  |  |  | 158.10% |  |  |  |  |
Percent of expected performance achievement of target for nonvested awards |  |  |  |  |  |  | 158.10% |  |  |  |  |
Total number of unvested shares (in shares) |  |  |  |  |  |  | 203,000 |  | 363,000 |  |  |
Market performance RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value units granted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.00 |  |  |  |  |
Stock units granted (in shares) |  |  |  |  |  |  | 0 |  |  |  |  |
Total number of unvested shares (in shares) |  |  |  |  |  |  | 0 |  | 154,000 |  |  |
Employee stock unit awards |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 4 years |  |  |  |  |
Aggregate unrecognized compensation | $ |  |  |  |  |  |  | $ 63,700 |  |  |  |  |
Period over which aggregate unrecognized compensation will be recognized |  |  |  |  |  |  | 2 years 4 months |  |  |  |  |
Weighted average fair value units granted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 45.36 |  | $ 36.96 |  | $ 22.12 |
Stock units granted (in shares) |  |  |  |  |  |  | 998,000 |  | 983,000 |  | 1,228,000 |
Total number of unvested shares (in shares) |  |  |  |  |  |  | 2,204,000 |  | 2,175,000 |  |  |
Non-employee director stock unit awards |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total number of unvested shares (in shares) |  |  |  |  |  |  | 12,257 |  |  |  |  |
Minimum | Stock options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 3 years |  |  |  |  |
Maximum | Stock options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 4 years |  |  |  |  |
Contractual term of equity share options |  |  |  |  |  |  | 10 years |  |  |  |  |
Subject to cash settlement | Performance-based RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in liability | $ |  |  |  |  |  |  | $ 2,845 |  |  |  |  |
Stock units granted (in shares) |  |  |  |  |  |  | 43,000 |  |  |  |  |
Total number of unvested shares (in shares) |  |  |  |  |  |  | 0 |  | 108,000 |  |  |
Subject to cash settlement | Non-employee director stock unit awards |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 1 year |  |  |  |  |
Vested but unsettled stock units (in shares) |  |  |  |  |  |  | 176,861 |  |  |  |  |
Subject to share settlement | Performance-based RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock units granted (in shares) |  |  |  |  |  |  | 244,000 |  |  |  |  |
Total number of unvested shares (in shares) |  |  |  |  |  |  | 203,000 |  | 255,000 |  |  |
Subject to share settlement | Non-employee director stock unit awards |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 1 year |  |  |  |  |
Tranche One | Performance-based RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Performance period |  |  |  |  |  |  | 1 year |  |  |  |  |
Weighted average fair value units granted (in dollars per share) | $ / shares |  |  |  |  | $ 33.02 | $ 38.01 |  |  |  |  |  |
Percent of performance achievement of target for vested awards |  |  |  |  |  |  | 180.20% |  |  |  |  |
Tranche Two | Performance-based RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Performance period |  |  |  |  |  |  | 2 years |  |  |  |  |
Weighted average fair value units granted (in dollars per share) | $ / shares |  |  |  |  | 34.85 | 39.76 |  |  |  |  |  |
Percent of expected performance achievement of target for nonvested awards |  |  |  |  |  |  | 180.20% |  |  |  |  |
Share-based Compensation Award, Tranche Three [Member] | Performance-based RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Performance period |  |  |  |  |  |  | 3 years |  |  |  |  |
Weighted average fair value units granted (in dollars per share) | $ / shares |  |  |  |  | $ 36.52 | $ 40.89 |  |  |  |  |  |
Chief Executive Officer | Tranche One | Market performance RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  |  |  |  |  |  |  | 0.00% |
Share-based compensation, terms of award |  |  |  | The award is eligible to vest during the period commencing February 26, 2014 and ending February 26, 2019 (the “Performance Period”) as follows: 30% of the restricted stock units covered by the award will vest if, during any consecutive 120 calendar day period that commences and ends during the Performance Period, the average per-share closing price of the Company’s common stock equals or exceeds $35.00 (“Tranche 1”) and the award will vest in full if, during any consecutive 120 calendar day period that commences and ends during the Performance Period, the average per-share closing price of the Company’s common stock equals or exceeds $40.00 (“Tranche 2”). The award will also vest if a majority change in control of the Company occurs during the Performance Period and, in connection with such event, the Company’s stockholders become entitled to receive per-share consideration having a value equal to or greater than $40.00. |  |  |  |  |  |  |  |
Percentage of award that will vest upon satisfaction of performance condition |  |  |  | 30.00% |  |  |  |  |  |  |  |
Award performance period |  |  |  | 120 days |  |  |  |  |  |  |  |
Minimum closing share price used to determine market condition (usd per share) | $ / shares |  |  |  | $ 35.00 |  |  |  |  |  |  |  |
Weighted average fair value units granted (in dollars per share) | $ / shares |  |  |  | $ 17.26 |  |  |  |  |  |  | $ 17.26 |
Chief Executive Officer | Tranche Two | Market performance RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  |  |  |  |  |  |  | 0.00% |
Percentage of award that will vest upon satisfaction of performance condition |  |  |  | 100.00% |  |  |  |  |  |  |  |
Award performance period |  |  |  | 120 days |  |  |  |  |  |  |  |
Minimum closing share price used to determine market condition (usd per share) | $ / shares |  |  |  | $ 40.00 |  |  |  |  |  |  |  |
Weighted average fair value units granted (in dollars per share) | $ / shares |  |  |  | $ 14.88 |  |  |  |  |  |  | $ 14.88 |
Other long-term liabilities | Subject to cash settlement | Non-employee director stock unit awards |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation liability, long-term | $ |  |  |  |  |  |  | $ 9,200 |  |  |  |  |
[1] | Restricted stock units granted includes awards that will be cash settled of 146,827 units in fiscal year 2019, 0 units in fiscal year 2018, and 115,500 units in fiscal year 2017.

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