Stock-Based Compensation (Overview) (Details) - USD ($)		3 Months Ended		9 Months Ended
	Nov. 25, 2024	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2025	Apr. 30, 2024	Jun. 09, 2025	Jan. 31, 2025	Oct. 31, 2024	Jul. 31, 2024	Dec. 31, 2023
2001 Employee Stock Purchase Plan
Estimated forfeitures related to unvested stock-based awards		$ 459,000		$ 459,000
Weighted average number of years net compensation cost is expected to be recognized over				1 year 9 months 18 days
Stock-based compensation capitalized and included in ending inventory		198,000		$ 198,000					$ 198,000
Income tax (expense) benefit from settlement of stock-based awards		$ 0	$ 76,000	$ (120,000)	$ (379,000)
Subsequent Event
2001 Employee Stock Purchase Plan
Forfeitures related to total unrecognized stock based compensation authorization pending						$ 2,000,000
Stock options
Stock-Based Awards Outstanding By Award Type (In Shares)
Number of stock-based awards outstanding at period end (in shares)		125,470		125,470			135,690	141,190	141,190
2000 Stock Incentive Plan
2000 Stock Incentive Plan
Aggregate maximum number of shares of common stock which may be issued under stock option plan (in shares)		15,757,500		15,757,500
Aggregate net number of stock-based awards granted (in shares)		12,275,972		12,275,972
Aggregate number of stock based awards expired and canceled (in shares)		7,549,532		7,549,532
Aggregate number of stock-based awards exercised (in shares)		10,316,998		10,316,998
Stock-Based Awards Outstanding By Award Type (In Shares)
Number of total stock-based awards outstanding (in shares)		1,958,974		1,958,974
2000 Stock Incentive Plan | Stock options
2000 Stock Incentive Plan
Maximum term for grants of incentive and non-qualified stock-based awards, excluding incentive stock-based awards granted to stockholders who own more than 10% of the voting power				10 years
Percentage of a stockholder's voting power that limits the contractual term of an incentive stock-based award		10.00%		10.00%
Maximum term for incentive stock-based awards granted to stockholders who own more than 10% of the voting power				5 years
Stock-Based Awards Outstanding By Award Type (In Shares)
Number of stock-based awards outstanding at period end (in shares)		125,470		125,470
2000 Stock Incentive Plan | Performance shares
Stock-Based Awards Outstanding By Award Type (In Shares)
Number of stock-based awards outstanding at period end (in shares)		666,173		666,173
2000 Stock Incentive Plan | RSUs and restricted stock
Stock-Based Awards Outstanding By Award Type (In Shares)
Number of stock-based awards outstanding at period end (in shares)		1,167,331		1,167,331
2000 Stock Incentive Plan | Stock Appreciation Rights (SARs)
Stock-Based Awards Outstanding By Award Type (In Shares)
Number of stock-based awards outstanding at period end (in shares)		0		0					0
2001 Employee Stock Purchase Plan | ESPP
2001 Employee Stock Purchase Plan
Total number of common shares reserved for issuance under employee stock purchase plan (in shares)		1,300,000		1,300,000
Discount rate from market value, on purchase date, offered to employees participating in the Employee Stock Purchase Plan (ESPP)		85.00%		85.00%
Total number of shares of common stock issued to employees under employee stock purchase plan and through the end of the reporting period (in shares)		1,092,359		1,092,359
2023 Equity and Incentive Plan
2000 Stock Incentive Plan
Aggregate maximum number of shares of common stock which may be issued under stock option plan (in shares)										1,669,683
Number of additional shares reserved for issuance (in shares)	2,195,000