Refer to as Adjusted Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization ("Adjusted EBITDA") to measure an operating segment’s performance and to make decisions about resources to be allocated during the period. The Company's Adjusted EBITDA metric does not consider any allocation of the following: income taxes, interest (income) and other expense, interest expense, amortization of stock-based compensation, amortization of intangibles, depreciation expense, settlement of intellectual property litigation, acquisition plan expenses or strategic alternatives analysis expenses and other.

No definition available.

Segment Information (Details)	3 Months Ended												12 Months Ended
Segment Information (Details)	Jul. 31, 2021 USD ($) ft²	Apr. 30, 2021 USD ($)	Jan. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Jul. 31, 2021 USD ($) ft²	Jul. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)
Segment Reporting Information, Profit (Loss)
Net sales	$ 145,809,000	$ 139,376,000	$ 161,292,000	$ 135,218,000	$ 149,673,000	$ 135,121,000	$ 161,654,000	$ 170,267,000	$ 176,372,000	$ 170,448,000	$ 164,133,000	$ 160,844,000	$ 581,695,000	$ 616,715,000	$ 671,797,000
Operating income (loss)													(68,298,000)	15,174,000	41,407,000
Net income (loss)	7,363,000	$ 792,000	$ 4,205,000	$ (85,840,000)	1,126,000	$ (3,989,000)	$ 3,495,000	$ 6,388,000	6,135,000	$ 7,612,000	$ 7,826,000	$ 3,468,000	(73,480,000)	7,020,000	25,041,000
(Benefit from) provision for income taxes													(1,500,000)	2,290,000	3,869,000
Interest (income) and other													(139,000)	(190,000)	35,000
Write-off of deferred financing costs													0	0	3,217,000
Interest expense													6,821,000	6,054,000	9,245,000
Amortization of stock-based compensation													9,983,000	9,275,000	11,427,000
Amortization of intangibles													21,020,000	21,595,000	18,320,000
Depreciation													9,379,000	10,561,000	11,927,000
Estimated contract settlement costs													0	444,000	6,351,000
Settlement of intellectual property litigation													0	0	(3,204,000)
Acquisition plan expenses													100,292,000	20,754,000	5,871,000
Restructuring costs													2,782,000		1,373,000
COVID-19 related costs													1,046,000	0	0
Strategic emerging technology costs													315,000
Adjusted EBITDA													76,519,000	77,803,000	93,472,000
Purchases of property, plant and equipment													16,037,000	7,225,000	8,785,000
Long-lived assets acquired in connection with acquisitions													47,958,000	38,451,000	60,693,000
Total assets	$ 993,111,000				929,647,000				887,711,000				993,111,000	929,647,000	887,711,000
Incremental interest expense on financing commitment letter													$ 1,178,000
Chandler, Arizona
Segment Reporting Information, Profit (Loss)
Area of property (in sq ft) \| ft²	146,000												146,000
Commercial Solutions
Segment Reporting Information, Profit (Loss)
Net sales													$ 360,146,000	353,730,000	357,293,000
Government Solutions
Segment Reporting Information, Profit (Loss)
Net sales													221,549,000	262,985,000	314,504,000
Operating Segments \| Commercial Solutions
Segment Reporting Information, Profit (Loss)
Net sales													360,146,000	353,730,000	357,293,000
Operating income (loss)													41,064,000	34,820,000	36,053,000
Net income (loss)													39,200,000	34,414,000	35,888,000
(Benefit from) provision for income taxes													1,794,000	410,000	19,000
Interest (income) and other													68,000	(31,000)	75,000
Write-off of deferred financing costs															0
Interest expense													2,000	27,000	71,000
Amortization of stock-based compensation													0	0	0
Amortization of intangibles													17,054,000	17,325,000	14,944,000
Depreciation													7,451,000	8,347,000	9,265,000
Estimated contract settlement costs														444,000	6,351,000
Settlement of intellectual property litigation															0
Acquisition plan expenses													(1,052,000)	751,000	0
Restructuring costs													1,804,000	0	0
COVID-19 related costs													0
Strategic emerging technology costs													0
Adjusted EBITDA													66,321,000	61,687,000	66,613,000
Purchases of property, plant and equipment													10,899,000	5,281,000	6,293,000
Long-lived assets acquired in connection with acquisitions													45,515,000	6,060,000	60,693,000
Total assets	$ 738,095,000				647,964,000				662,580,000				738,095,000	647,964,000	662,580,000
Operating Segments \| Government Solutions
Segment Reporting Information, Profit (Loss)
Net sales													221,549,000	262,985,000	314,504,000
Operating income (loss)													8,402,000	19,988,000	28,997,000
Net income (loss)													9,553,000	20,232,000	29,029,000
(Benefit from) provision for income taxes													(1,376,000)	(100,000)	0
Interest (income) and other													161,000	(169,000)	(41,000)
Write-off of deferred financing costs															0
Interest expense													64,000	25,000	9,000
Amortization of stock-based compensation													0	0	0
Amortization of intangibles													3,966,000	4,270,000	3,376,000
Depreciation													1,586,000	1,446,000	1,891,000
Estimated contract settlement costs														0	0
Settlement of intellectual property litigation															0
Acquisition plan expenses													0	0	0
Restructuring costs													978,000		1,373,000
COVID-19 related costs													1,046,000
Strategic emerging technology costs													315,000
Adjusted EBITDA													16,293,000	25,704,000	35,637,000
Purchases of property, plant and equipment													5,055,000	1,617,000	1,902,000
Long-lived assets acquired in connection with acquisitions													2,443,000	32,391,000	0
Total assets	232,763,000				232,052,000				186,438,000				232,763,000	232,052,000	186,438,000
Unallocated
Segment Reporting Information, Profit (Loss)
Net sales													0	0	0
Operating income (loss)													(117,764,000)	(39,634,000)	(23,643,000)
Net income (loss)													(122,233,000)	(47,626,000)	(39,876,000)
(Benefit from) provision for income taxes													(1,918,000)	1,980,000	3,850,000
Interest (income) and other													(368,000)	10,000	1,000
Write-off of deferred financing costs															3,217,000
Interest expense													6,755,000	6,002,000	9,165,000
Amortization of stock-based compensation														9,275,000	11,427,000
Amortization of intangibles													0	0	0
Depreciation													342,000	768,000	771,000
Estimated contract settlement costs														0	0
Settlement of intellectual property litigation															(3,204,000)
Acquisition plan expenses													101,344,000	20,003,000	5,871,000
Restructuring costs													0		0
COVID-19 related costs													0
Strategic emerging technology costs													0
Adjusted EBITDA													(6,095,000)	(9,588,000)	(8,778,000)
Purchases of property, plant and equipment													83,000	327,000	590,000
Long-lived assets acquired in connection with acquisitions													0	0	0
Total assets	$ 22,253,000				$ 49,631,000				$ 38,693,000				22,253,000	49,631,000	38,693,000
Intersegment Eliminations \| Commercial Solutions
Segment Reporting Information, Profit (Loss)
Net sales													$ 3,481,000	$ 9,837,000	$ 17,371,000