Net Earnings (Loss) Per Share - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Oct. 31, 2015 USD ($) $ / shares shares	Aug. 01, 2015 USD ($)	Nov. 01, 2014 USD ($) $ / shares shares	Oct. 31, 2015 USD ($) $ / shares shares	Nov. 01, 2014 USD ($) $ / shares shares	Aug. 02, 2015 shares	May. 02, 2015 $ / shares shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Preferred Stock, Shares Outstanding	0		0	0	0	0	0
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01		$ 0.00	$ 0.01	$ 0.00		$ 0.00
Common Stock, Shares Authorized	200,000,000		0	200,000,000	0		0
Net Income (Loss) Attributable to Parent | $	$ 33,401	$ (26,918)	$ 36,951	$ 6,483	$ 10,738
Basic weighted average shares of Common Stock	48,207,000		37,505,000	44,816,000	37,471,000
Average restricted stock units	355,000		0	178,000	0
Average dilutive options	0		39,000	29,000	33,000
Diluted weighted average shares of Common Stock	48,562,000		37,544,000	45,023,000	37,504,000
Basic | $ / shares	$ 0.69		$ 0.95	$ 0.14	$ 0.26
Diluted | $ / shares	$ 0.69		$ 0.95	$ 0.14	$ 0.26
Less allocation of earnings and dividends to participating securities | $	$ (22)		$ (944)	$ (26)	$ (255)
Net income available to common shareholders | $	33,379		35,564	6,457	9,598
Accretion of dividends on preferred stock (a) | $	0		(443)	0	(885)
Accretion of dividends on preferred stock diluted | $	0		0	0	0
Undistributed Earnings, Basic | $	22		944	26	255
Less diluted allocation of earnings and dividends to participating securities | $	(22)		(943)	(26)	(255)
Net income available to common shareholders | $	$ 33,379		$ 35,565	$ 6,457	$ 9,598
Preferred Stock, Shares Authorized	5,000,000		0	5,000,000	0		0
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.01		$ 0.00	$ 0.01	$ 0.00		$ 0.00
Common Stock, Shares, Outstanding	48,217,000		0	48,217,000	0	48,186,900	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized				2,409,345
Spinoff [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio		0.632