Earnings (Loss) Per Share Attributable to Common Stockholders - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jan. 30, 2021	Feb. 01, 2020	Jan. 30, 2021	Feb. 01, 2020
Numerator:
Net income (loss)	$ (21,039)	$ 11,431	$ (11,498)	$ 11,253
Net income (loss) attributable to common stockholders - basic	(21,039)	11,431	(11,498)	11,253
Net income (loss) attributable to common stockholders - diluted	$ (21,039)	$ 11,431	$ (11,498)	$ 11,253
Denominator:
Weighted-average shares of common stock - basic (in shares)	105,544,515	102,045,087	104,840,283	101,801,666
Weighted-average shares of common stock - diluted (in shares)	105,544,515	104,637,548	104,840,283	104,018,782
Earnings (loss) per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.20)	$ 0.11	$ (0.11)	$ 0.11
Diluted (in dollars per share)	$ (0.20)	$ 0.11	$ (0.11)	$ 0.11
Class A Common Stock
Numerator:
Net income (loss)	$ (12,790)	$ 6,243	$ (6,765)	$ 6,113
Net income (loss) attributable to common stockholders - basic	(12,790)	6,243	(6,765)	6,113
Reallocation of undistributed earnings (loss) as a result of conversion of Class B to Class A shares	0	5,188	0	5,140
Reallocation of undistributed earnings (loss) to Class B shares	0	0	0	0
Net income (loss) attributable to common stockholders - diluted	$ (12,790)	$ 11,431	$ (6,765)	$ 11,253
Denominator:
Weighted-average shares of common stock - basic (in shares)	64,163,400	55,733,232	61,685,068	55,300,571
Conversion of Class B to Class A common shares outstanding (in shares)	0	46,311,855	0	46,501,095
Effect of dilutive stock options and restricted stock units (in shares)	0	2,592,461	0	2,217,116
Weighted-average shares of common stock - diluted (in shares)	64,163,400	104,637,548	61,685,068	104,018,782
Earnings (loss) per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.20)	$ 0.11	$ (0.11)	$ 0.11
Diluted (in dollars per share)	$ (0.20)	$ 0.11	$ (0.11)	$ 0.11
Class B Common Stock
Numerator:
Net income (loss)	$ (8,249)	$ 5,188	$ (4,733)	$ 5,140
Net income (loss) attributable to common stockholders - basic	(8,249)	5,188	(4,733)	5,140
Reallocation of undistributed earnings (loss) as a result of conversion of Class B to Class A shares	0	0	0	0
Reallocation of undistributed earnings (loss) to Class B shares	0	64	0	78
Net income (loss) attributable to common stockholders - diluted	$ (8,249)	$ 5,252	$ (4,733)	$ 5,218
Denominator:
Weighted-average shares of common stock - basic (in shares)	41,381,115	46,311,855	43,155,215	46,501,095
Conversion of Class B to Class A common shares outstanding (in shares)	0	0	0	0
Effect of dilutive stock options and restricted stock units (in shares)	0	1,760,938	0	1,736,121
Weighted-average shares of common stock - diluted (in shares)	41,381,115	48,072,793	43,155,215	48,237,216
Earnings (loss) per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.20)	$ 0.11	$ (0.11)	$ 0.11
Diluted (in dollars per share)	$ (0.20)	$ 0.11	$ (0.11)	$ 0.11

Earnings (Loss) Per Share Attributable to Common Stockholders - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

6 Months Ended

Jan. 30, 2021

Feb. 01, 2020

Jan. 30, 2021

Feb. 01, 2020

Numerator:

Net income (loss)

$ (21,039)

$ 11,431

$ (11,498)

$ 11,253