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Stock-Based Compensation - Narrative (Detail) - USD ($)

3 Months Ended

6 Months Ended

Oct. 29, 2017

Oct. 02, 2017

Jul. 13, 2017

Oct. 03, 2016

Jul. 14, 2016

Jul. 30, 2017

Oct. 29, 2017

Oct. 30, 2016

Sep. 16, 2015

2015 Equity Incentive Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of common stock authorized for issuance

1,200,000

Number of shares available for future equity based grants

902,556

902,556

2007 Equity Incentive Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares available for future equity based grants

0

Performance Based Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Remaining unrecognized compensation cost

$ 4,300,000

$ 4,300,000

Weighted average period over which unrecognized compensation cost is expected to be recognized

1 year 10 months 25 days

Incentive Stock Option Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of options granted

0

Number of options to purchase common stock outstanding

15,000

15,000

Number of options exercisable

15,000

15,000

Weighted average exercise price for options outstanding

$ 7.08

$ 7.08

Weighted average exercise price for options exercisable

$ 7.08

$ 7.08

Weighted average contractual term for options outstanding

7 months 6 days

Weighted average contractual term for options exercisable

7 months 6 days

Aggregate intrinsic value for options outstanding

$ 373,000

$ 373,000

Aggregate intrinsic value for options exercisable

$ 373,000

373,000

Aggregate intrinsic value for options exercised

$ 14,000

$ 43,000

Number of unvested stock options

0

0

Unrecognized compensation cost related to incentive stock options

$ 0

$ 0

Share-based compensation expense

0

0

Time Vested Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Remaining unrecognized compensation cost

$ 27,000

$ 27,000

Vesting Period

7 months 15 days

Selling, General and Administrative Expenses [Member] | Performance Based Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based compensation expense

$ 1,400,000

1,500,000

Selling, General and Administrative Expenses [Member] | Time Vested Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based compensation expense

17,000

11,000

Selling, General and Administrative Expenses [Member] | Common Stock Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based compensation expense

$ 159,000

$ 143,000

Employee [Member] | Performance Based Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares granted

^[1],[2]

44,000

Vesting Period

^[2]

3 years

Closing price of common stock

^[2],[3]

$ 32.50

Employee [Member] | Time Vested Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares granted

1,200

1,200

Vesting Period

11 months

11 months

Closing price of common stock

$ 32.50

$ 28

Number of shares vested

1,200

Weighted average fair value of vested shares

$ 34,000

Weighted average fair value of vested shares, per share

$ 28

Outside Directors [Member] | Common Stock Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares granted

4,800

4,800

Vesting Period

0 days

0 days

Closing price of common stock

$ 33.20

$ 29.80

[1]	Amounts represent the maximum number of common stock shares that could be earned if certain performance targets are met as defined in the related restricted stock unit agreements.
[2]	Performance-based restricted stock units awarded to key employees.
[3]	Price per share represents the closing price of our common stock on the date of grant.

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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