Condensed Consolidating Financial Statements (Balance Sheets) (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Apr. 30, 2018	Jul. 31, 2017	Apr. 30, 2017
Condensed Financial Statements, Captions [Line Items]
Cash & cash equivalents	$ 979,116	$ 1,544,944	$ 551,566
Cash and cash equivalents - restricted	131,376	118,734	116,594
Receivables, short-term	70,576	146,774	91,004
Income taxes receivable	15,776	12,310
Prepaid expenses and other current assets	85,279	68,951	74,776
Total current assets	1,282,123	1,891,713	833,940
Property and equipment, net	227,003	231,888	253,255
Intangible assets, net	354,831	373,981	393,972
Goodwill	507,941	507,871	493,991	$ 491,207
Deferred tax assets and income taxes receivable	131,683	34,095	54,348
Amounts due from affiliates	0	0	0
Other noncurrent assets	101,457	101,401	102,742
Total assets	2,605,038	3,140,949	2,132,248
Accounts payable and accrued expenses	145,471	251,975	161,751
Accrued salaries, wages and payroll taxes	37,468	141,499	35,063
Accrued income taxes and reserves for uncertain tax positions	178,313	263,050	176,909
Current portion of long-term debt	1,038	1,026	992
Deferred revenue and other current liabilities	201,706	186,101	187,791
Total current liabilities	563,996	843,651	562,506
Long-term debt	1,495,006	1,494,609	1,493,422
Deferred tax liabilities and reserves for uncertain tax positions	231,292	229,430	159,233
Deferred revenue and other noncurrent liabilities	122,735	179,548	131,415
Total liabilities	2,413,029	2,747,238	2,346,576
Stockholders’ equity	192,009	393,711	(214,328)
Total liabilities and stockholders' equity	2,605,038	3,140,949	2,132,248
Eliminations
Condensed Financial Statements, Captions [Line Items]
Income taxes receivable		(2,801)
Total current assets		(2,801)
Investments in subsidiaries	(2,891,056)	(2,933,123)	(2,144,639)
Amounts due from affiliates	(4,098,900)	(3,942,892)	(3,704,992)
Other noncurrent assets	0
Total assets	(6,989,956)	(6,878,816)	(5,849,631)
Accrued income taxes and reserves for uncertain tax positions		(2,801)
Total current liabilities		(2,801)
Amounts due to affiliates	(4,098,900)	(3,942,892)	(3,704,992)
Total liabilities	(4,098,900)	(3,945,693)	(3,704,992)
Stockholders’ equity	(2,891,056)	(2,933,123)	(2,144,639)
Total liabilities and stockholders' equity	(6,989,956)	(6,878,816)	(5,849,631)
H&R Block, Inc. (Guarantor) | Reportable entities
Condensed Financial Statements, Captions [Line Items]
Receivables, short-term			16
Income taxes receivable	2,811	2,801
Total current assets	2,811	2,801	16
Deferred tax assets and income taxes receivable		1,400	5,587
Investments in subsidiaries	2,762,660	2,801,808	2,037,691
Amounts due from affiliates		0	0
Total assets	2,765,471	2,806,009	2,043,294
Accounts payable and accrued expenses	2,216	2,074	2,246
Total current liabilities	2,216	2,074	2,246
Deferred tax liabilities and reserves for uncertain tax positions	10,465	9,286	28,324
Amounts due to affiliates	2,560,781	2,400,938	2,227,052
Total liabilities	2,573,462	2,412,298	2,257,622
Stockholders’ equity	192,009	393,711	(214,328)
Total liabilities and stockholders' equity	2,765,471	2,806,009	2,043,294
Block Financial (Issuer) | Reportable entities
Condensed Financial Statements, Captions [Line Items]
Cash & cash equivalents	3,759	4,346	7,480
Cash and cash equivalents - restricted			8,069
Receivables, short-term	40,457	51,562	54,187
Prepaid expenses and other current assets	1,954	1,954	2,280
Total current assets	46,170	57,862	72,016
Property and equipment, net	418	467	66
Deferred tax assets and income taxes receivable	17,941	17,798	32,047
Amounts due from affiliates	1,538,119	1,541,954	1,477,940
Other noncurrent assets	56,004	50,073	60,242
Total assets	1,658,652	1,668,154	1,642,311
Accounts payable and accrued expenses	7,511	16,628	6,870
Accrued salaries, wages and payroll taxes	1,423	1,161	1,070
Accrued income taxes and reserves for uncertain tax positions	1,060	1,060
Deferred revenue and other current liabilities	24,952	22,172	30,412
Total current liabilities	34,946	41,021	38,352
Long-term debt	1,490,668	1,490,007	1,488,046
Deferred tax liabilities and reserves for uncertain tax positions	3,989	4,963	8,037
Deferred revenue and other noncurrent liabilities	653	848	928
Total liabilities	1,530,256	1,536,839	1,535,363
Stockholders’ equity	128,396	131,315	106,948
Total liabilities and stockholders' equity	1,658,652	1,668,154	1,642,311
Other Subsidiaries | Reportable entities
Condensed Financial Statements, Captions [Line Items]
Cash & cash equivalents	975,357	1,540,598	544,086
Cash and cash equivalents - restricted	131,376	118,734	108,525
Receivables, short-term	30,119	95,212	36,801
Income taxes receivable	12,965	12,310
Prepaid expenses and other current assets	83,325	66,997	72,496
Total current assets	1,233,142	1,833,851	761,908
Property and equipment, net	226,585	231,421	253,189
Intangible assets, net	354,831	373,981	393,972
Goodwill	507,941	507,871	493,991
Deferred tax assets and income taxes receivable	113,742	14,897	16,714
Investments in subsidiaries	128,396	131,315	106,948
Amounts due from affiliates	2,560,781	2,400,938	2,227,052
Other noncurrent assets	45,453	51,328	42,500
Total assets	5,170,871	5,545,602	4,296,274
Accounts payable and accrued expenses	135,744	233,273	152,635
Accrued salaries, wages and payroll taxes	36,045	140,338	33,993
Accrued income taxes and reserves for uncertain tax positions	177,253	264,791	176,909
Current portion of long-term debt	1,038	1,026	992
Deferred revenue and other current liabilities	176,754	163,929	157,379
Total current liabilities	526,834	803,357	521,908
Long-term debt	4,338	4,602	5,376
Deferred tax liabilities and reserves for uncertain tax positions	216,838	215,181	122,872
Deferred revenue and other noncurrent liabilities	122,082	178,700	130,487
Amounts due to affiliates	1,538,119	1,541,954	1,477,940
Total liabilities	2,408,211	2,743,794	2,258,583
Stockholders’ equity	2,762,660	2,801,808	2,037,691
Total liabilities and stockholders' equity	$ 5,170,871	$ 5,545,602	$ 4,296,274